ruby/configure.in

dnl Process this file with autoconf to produce a configure script.
AC_INIT()

AC_PREREQ(2.60)

AC_ARG_WITH(baseruby,
	[  --with-baseruby=RUBY use RUBY as baseruby; RUBY is the pathname of ruby],
	[
		case "$withval" in
		*ruby*)
			BASERUBY=$withval
			;;
		*)
			AC_MSG_ERROR(need ruby)
			;;
		esac
	],
	[
		BASERUBY="ruby"
	])
test "`$BASERUBY -e 'p 42' 2>/dev/null`" = 42 ||
    BASERUBY="echo executable host ruby is required.  use --with-baseruby option.; false"
AC_SUBST(BASERUBY)

AC_DEFUN([RUBY_MINGW32],
[case "$host_os" in
cygwin*)
AC_CACHE_CHECK(for mingw32 environment, rb_cv_mingw32,
[AC_TRY_CPP([
#ifndef __MINGW32__
# error
#endif
], rb_cv_mingw32=yes,rb_cv_mingw32=no)
rm -f conftest*])
test "$rb_cv_mingw32" = yes && target_os="mingw32"
  ;;
esac])

AC_DEFUN([RUBY_CPPOUTFILE],
[AC_CACHE_CHECK(whether ${CPP} accepts -o, rb_cv_cppoutfile,
[cppflags=$CPPFLAGS
CPPFLAGS='-o conftest.i'
AC_TRY_CPP([], rb_cv_cppoutfile=yes, rb_cv_cppoutfile=no)
CPPFLAGS=$cppflags
rm -f conftest*])
if test "$rb_cv_cppoutfile" = yes; then
  CPPOUTFILE='-o conftest.i'
elif test "$rb_cv_cppoutfile" = no; then
  CPPOUTFILE='> conftest.i'
elif test -n "$rb_cv_cppoutfile"; then
  CPPOUTFILE="$rb_cv_cppoutfile"
fi
AC_SUBST(CPPOUTFILE)])

AC_DEFUN([RUBY_PROG_GNU_LD],
[AC_CACHE_CHECK(whether the linker is GNU ld, rb_cv_prog_gnu_ld,
[if `$CC $CFLAGS $CPPFLAGS $LDFLAGS --print-prog-name=ld 2>&1` -v 2>&1 | grep "GNU ld" > /dev/null; then
  rb_cv_prog_gnu_ld=yes
else
  rb_cv_prog_gnu_ld=no
fi
])
GNU_LD=$rb_cv_prog_gnu_ld
AC_SUBST(GNU_LD)])

unset GREP_OPTIONS
rb_version=`grep RUBY_VERSION $srcdir/version.h`
MAJOR=`expr "$rb_version" : '#define RUBY_VERSION "\([0-9][0-9]*\)\.[0-9][0-9]*\.[0-9][0-9]*"'`
MINOR=`expr "$rb_version" : '#define RUBY_VERSION "[0-9][0-9]*\.\([0-9][0-9]*\)\.[0-9][0-9]*"'`
TEENY=`expr "$rb_version" : '#define RUBY_VERSION "[0-9][0-9]*\.[0-9][0-9]*\.\([0-9][0-9]*\)"'`
if test "$MAJOR" = ""; then
  AC_MSG_ERROR(could not determine MAJOR number from version.h)
fi
if test "$MINOR" = ""; then
  AC_MSG_ERROR(could not determine MINOR number from version.h)
fi
if test "$TEENY" = ""; then
  AC_MSG_ERROR(could not determine TEENY number from version.h)
fi
AC_SUBST(MAJOR)
AC_SUBST(MINOR)
AC_SUBST(TEENY)
dnl checks for alternative programs
AC_ARG_WITH(gcc, [  --without-gcc           never use gcc], [
	case $withval in
	no)	: ${CC=cc}
		;;
	yes)	: ${CC=gcc}
		;;
	*)	CC=$withval
		;;
	esac])
dnl If the user switches compilers, we can't believe the cache
if test ! -z "$ac_cv_prog_CC" -a ! -z "$CC" -a "$CC" != "$ac_cv_prog_CC"
then
  AC_MSG_ERROR(cached CC is different -- throw away $cache_file
(it is also a good idea to do 'make clean' before compiling))
fi

if test "$program_prefix" = NONE; then
  program_prefix=
fi

AC_CANONICAL_TARGET
target_os=`echo $target_os | sed 's/linux-gnu$/linux/;s/linux-gnu/linux-/'`
ac_install_sh='' # unusable for extension libraries.

ifelse(currently,disabled, [
dnl checks for fat-binary
AC_ARG_ENABLE(fat-binary,
       [  --enable-fat-binary=ARCHS
                          build an Apple/NeXT Multi Architecture Binary (MAB);
                          ARCHS is a comma-delimited list of architectures for
                          which to build; if ARCHS is omitted, then the package
                          will be built for all architectures supported by the
                          platform ("ppc" for MacOS/X and Darwin; "ppc,i386"
                          for Rhapsody; "m68k,i386,sparc" for OpenStep;
                          "m68k,i386,sparc,hppa" for NextStep); if this option
                          is disabled or omitted entirely, then the package
                          will be built only for the target platform],
       [fat_binary=$enableval], [fat_binary=no])
if test "$fat_binary" != no; then

    AC_MSG_CHECKING([target architectures])

    # Respect TARGET_ARCHS setting from environment if available.
    if test -z "$TARGET_ARCHS"; then
	# Respect ARCH given to --enable-fat-binary if present.
	if test "$fat_binary" != yes; then
	    TARGET_ARCHS=`echo "$fat_binary" | tr ',' ' '`
	else
	    # Choose a default set of architectures based upon platform.
	    case "$target_os" in
	    darwin*)
		TARGET_ARCHS="ppc"
		;;
	    rhapsody*)
		TARGET_ARCHS="ppc i386"
		;;
	    openstep*)
		TARGET_ARCHS="m68k i386 sparc"
		;;
	    nextstep*)
		TARGET_ARCHS="m68k i386 sparc hppa"
		;;
	    *)
		TARGET_ARCHS=`arch`
	    esac
	fi
    fi

    AC_MSG_RESULT([$TARGET_ARCHS])

    # /usr/lib/arch_tool -archify_list $TARGET_ARCHS
    ARCH_FLAG=
    for archs in $TARGET_ARCHS 
    do
        ARCH_FLAG="$ARCH_FLAG -arch $archs"
    done
    AC_DEFINE(NEXT_FAT_BINARY)
fi
], [fat_binary=no])

case $target_cpu in
  i?86) frame_address=yes;;
  *)    frame_address=no;;
esac
AC_ARG_ENABLE(frame-address,
       [  --enable-frame-address  use GCC __builtin_frame_address(). ],
       [frame_address=$enableval])
if test $frame_address = yes; then
    AC_DEFINE(USE_BUILTIN_FRAME_ADDRESS)
fi

AC_ARG_PROGRAM

dnl Checks for programs.

: ${CFLAGS=} ${cflags='${optflags} ${debugflags} ${warnflags}'}
: ${CXXFLAGS=} ${cxxflags='${optflags} ${debugflags} ${warnflags}'}
if test x"${build}" != x"${host}"; then
  AC_CHECK_TOOL(CC, gcc)
fi
AC_PROG_CC
AC_PROG_CXX
AC_PROG_GCC_TRADITIONAL
test $ac_cv_prog_cc_g = yes && : ${debugflags=-g}
if test "$GCC" = yes; then
    linker_flag=-Wl,
    : ${optflags=-O2} ${warnflags="-Wall -Wno-parentheses"}
else
    linker_flag=
fi
CFLAGS="${CFLAGS} `eval echo $cflags`"
CXXFLAGS="${CXXFLAGS} `eval echo $cxxflags`"

RUBY_PROG_GNU_LD
RUBY_CPPOUTFILE

: ${OUTFLAG='-o '}
: ${COUTFLAG=${OUTFLAG}}
AC_SUBST(OUTFLAG)
AC_SUBST(COUTFLAG)

RUBY_MINGW32

AC_CHECK_TOOL(RANLIB, ranlib, :)
AC_CHECK_TOOL(AR, ar)
if test -z "$AR"; then
  AC_CHECK_PROGS(AR, aal, ar)
fi

AC_CHECK_TOOL(AS, as)
ASFLAGS=$ASFLAGS
AC_SUBST(ASFLAGS)

case "$target_os" in
cygwin*|mingw*)
    AC_CHECK_TOOL(NM, nm)
    AC_CHECK_TOOL(WINDRES, windres)
    AC_CHECK_TOOL(DLLWRAP, dllwrap)
    target_cpu=`echo $target_cpu | sed s/i.86/i386/`
    case "$target_os" in
    mingw*)
	test "$rb_cv_msvcrt" = "" && unset rb_cv_msvcrt
	AC_CHECK_TOOL(OBJDUMP, objdump)
	AC_CACHE_CHECK(for mingw32 runtime DLL, rb_cv_msvcrt, [
	AC_TRY_LINK([#include <stdio.h>],
		    [FILE* volatile f = stdin; return 0;],
		    [rb_cv_msvcrt=`$OBJDUMP -p conftest$ac_exeext |
				   tr A-Z a-z |
				   sed -n '/^[[ 	]]*dll name: \(msvc.*\)\.dll$/{s//\1/p;q;}'`],
		    [rb_cv_msvcrt=msvcrt])
	test "$rb_cv_msvcrt" = "" && rb_cv_msvcrt=msvcrt])
    esac
    : ${enable_shared=yes}
    ;;
aix*)
    AC_CHECK_TOOL(NM, nm, /usr/ccs/bin/nm, /usr/ccs/bin:$PATH)
    ;;
hiuxmpp*)
    # by TOYODA Eizi <toyoda@npd.kishou.go.jp>
    AC_DEFINE(__HIUX_MPP__)
    ;;
esac

AC_PROG_LN_S
AC_PROG_MAKE_SET
AC_PROG_INSTALL

# checks for UNIX variants that set C preprocessor variables
AC_USE_SYSTEM_EXTENSIONS

AC_SUBST(RM, ['rm -f'])
AC_SUBST(CP, ['cp'])
if $as_mkdir_p; then
  MAKEDIRS='mkdir -p'
else
  MAKEDIRS='install -d'
fi
AC_SUBST(MAKEDIRS)

dnl check for large file stuff
mv confdefs.h confdefs1.h
: > confdefs.h
AC_SYS_LARGEFILE
mv confdefs.h largefile.h
mv confdefs1.h confdefs.h
cat largefile.h >> confdefs.h

case "$target_os" in
mingw*)
	ac_cv_type_off_t=yes
	ac_cv_sizeof_off_t=8
	;;
esac

AC_CHECK_TYPES([long long, off_t])

AC_CHECK_SIZEOF(int, 4)
AC_CHECK_SIZEOF(short, 2)
AC_CHECK_SIZEOF(long, 4)
AC_CHECK_SIZEOF(long long, 0)
AC_CHECK_SIZEOF(__int64, 0)
AC_CHECK_SIZEOF(off_t, 0)
AC_CHECK_SIZEOF(void*, 4)
AC_CHECK_SIZEOF(float, 4)
AC_CHECK_SIZEOF(double, 8)
AC_CHECK_SIZEOF(time_t, 0)

dnl RUBY_REPLACE_TYPE [typename] [default type] [macro type] [included]
AC_DEFUN([RUBY_REPLACE_TYPE], [dnl
    AC_CHECK_TYPE([$1],
	[AC_DEFINE_UNQUOTED(rb_[$1], [$1])],
	[AC_DEFINE_UNQUOTED(rb_[$1], [$2])],
	[$4])
    AC_CACHE_CHECK([for convertible type of [$1]], rb_cv_[$1]_convertible, [
	u= t=
	AC_COMPILE_IFELSE(
	    [AC_LANG_BOOL_COMPILE_TRY([AC_INCLUDES_DEFAULT]
				      [$4], [(rb_[$1])-1 > 0])],
	    [u=U])
	if test x"$t" = x; then
	    AC_COMPILE_IFELSE(
		[AC_LANG_BOOL_COMPILE_TRY([AC_INCLUDES_DEFAULT]
					  [$4], [sizeof(rb_[$1]) > sizeof(long)])],
		[t=LL])
	fi
	if test x"$t" = x; then
	    AC_COMPILE_IFELSE(
		[AC_LANG_BOOL_COMPILE_TRY([AC_INCLUDES_DEFAULT]
					  [$4], [sizeof(rb_[$1]) == sizeof(long)])],
		[t=LONG])
	fi
	if test x"$t" = x; then
	    t=INT
	fi
	rb_cv_[$1]_convertible=${u}${t}])
    AC_DEFINE_UNQUOTED([$3]2NUM[(v)], [${rb_cv_[$1]_convertible}2NUM(v)])
    AC_DEFINE_UNQUOTED(NUM2[$3][(v)], [NUM2${rb_cv_[$1]_convertible}(v)])
])
RUBY_REPLACE_TYPE(pid_t, int, PIDT)
RUBY_REPLACE_TYPE(uid_t, int, UIDT)
RUBY_REPLACE_TYPE(gid_t, int, GIDT)

AC_CACHE_CHECK(for prototypes, rb_cv_have_prototypes,
  [AC_TRY_COMPILE([int foo(int x) { return 0; }], [return foo(10);],
	rb_cv_have_prototypes=yes,
	rb_cv_have_prototypes=no)])
if test "$rb_cv_have_prototypes" = yes; then
  AC_DEFINE(HAVE_PROTOTYPES)
fi

AC_CACHE_CHECK(token paste string, rb_cv_tokenpaste,
  [AC_TRY_COMPILE([#define paste(a,b) a##b],
		  [int xy = 1; return paste(x,y);],
		  rb_cv_tokenpaste=ansi,
		  rb_cv_tokenpaste=knr)])
if test "$rb_cv_tokenpaste" = ansi; then
  AC_DEFINE(TOKEN_PASTE(x,y),[x##y])
else
  AC_DEFINE(TOKEN_PASTE(x,y),[x/**/y])
fi

AC_CACHE_CHECK(stringization, rb_cv_stringization, [
  rb_cv_stringization=no
  for string in "#expr" '"expr"'; do
    AC_COMPILE_IFELSE([
      AC_LANG_BOOL_COMPILE_TRY([
#define STRINGIZE0(expr) $string
#define STRINGIZE(expr) STRINGIZE0(expr)
#undef real_test_for_stringization
#define test_for_stringization -.real_test_for_stringization.-
const char stringized[[]] = STRINGIZE(test_for_stringization);
], [sizeof(stringized) == 32])],
      [rb_cv_stringization="$string"; break],
      [rb_cv_stringization=no])
  done]
)
AC_DEFINE(STRINGIZE(expr),STRINGIZE0(expr))
if test x"$rb_cv_stringization" != xno -a "$rb_cv_stringization" != "#expr"; then
  AC_DEFINE_UNQUOTED(STRINGIZE0(expr),$rb_cv_stringization)
  AC_DEFINE(OLD_FASHIONED_STRINGIZATION,1)
fi

AC_CACHE_CHECK([string literal concatenation],
  rb_cv_string_literal_concatenation, [
  AC_COMPILE_IFELSE([
    AC_LANG_BOOL_COMPILE_TRY([
const char concatenated_literal[[]] = "literals" "to"
  "be" "concatenated.";
], [sizeof(concatenated_literal) == 26])],
    [rb_cv_string_literal_concatenation=yes],
    [rb_cv_string_literal_concatenation=no])]
)
if test "$rb_cv_string_literal_concatenation" = no; then
  AC_DEFINE(NO_STRING_LITERAL_CONCATENATION,1)
fi

AC_CACHE_CHECK(for variable length prototypes and stdarg.h, rb_cv_stdarg,
  [AC_TRY_COMPILE([
#include <stdarg.h>
int foo(int x, ...) {
	va_list va;
	va_start(va, x);
	va_arg(va, int);
	va_arg(va, char *);
	va_arg(va, double);
	return 0;
}
], [return foo(10, "", 3.14);],
	rb_cv_stdarg=yes,
	rb_cv_stdarg=no)])
if test "$rb_cv_stdarg" = yes; then
  AC_DEFINE(HAVE_STDARG_PROTOTYPES)
fi

AC_CACHE_CHECK(for variable length macro, rb_cv_va_args_macro,
  [AC_TRY_COMPILE([@%:@define FOO(a, ...) foo(a, @%:@@%:@__VA_ARGS__)],
  [FOO(1);FOO(1,2);FOO(1,2,3);],
  rb_cv_va_args_macro=yes,
  rb_cv_va_args_macro=no)])
if test "$rb_cv_va_args_macro" = yes; then
  AC_DEFINE(HAVE_VA_ARGS_MACRO)
fi

AC_DEFUN([RUBY_FUNC_ATTRIBUTE], [dnl
m4_ifval([$2], dnl
  [AS_VAR_PUSHDEF([attrib],[$2])], dnl
  [AS_VAR_PUSHDEF([attrib],[FUNC_]AS_TR_CPP($1))] dnl
)dnl
m4_ifval([$3], dnl
  [AS_VAR_PUSHDEF([rbcv],[$3])], dnl
  [AS_VAR_PUSHDEF([rbcv],[rb_cv_func_][$1])]dnl
)dnl
AC_CACHE_CHECK(for [$1] function attribute, rbcv,
[rbcv=x
if test "${ac_c_werror_flag+set}"; then
  rb_c_werror_flag="$ac_c_werror_flag"
else
  unset rb_c_werror_flag
fi
ac_c_werror_flag=yes
for mac in "__attribute__ (($1)) x" "x __attribute__ (($1))" "__declspec($1) x" x; do
  AC_TRY_COMPILE(
    [#define ]attrib[(x) $mac
    ]attrib[(void conftest_attribute_check(void));], [],
    [rbcv="$mac"; break])
done
if test "${rb_c_werror_flag+set}"; then
  ac_c_werror_flag="$rb_c_werror_flag"
else
  unset ac_c_werror_flag
fi
])
AC_DEFINE_UNQUOTED(attrib[(x)], $rbcv)
AS_VAR_POPDEF([attrib])
AS_VAR_POPDEF([rbcv])
])

RUBY_FUNC_ATTRIBUTE(noreturn, NORETURN)
RUBY_FUNC_ATTRIBUTE(deprecated, DEPRECATED)
RUBY_FUNC_ATTRIBUTE(noinline, NOINLINE)
RUBY_FUNC_ATTRIBUTE(stdcall)
RUBY_FUNC_ATTRIBUTE(cdecl)
RUBY_FUNC_ATTRIBUTE(fastcall)

if test "$GCC" = yes; then
    AC_CACHE_CHECK([for function alias], [rb_cv_gcc_function_alias],
	[rb_cv_gcc_function_alias=no
	for a in alias weak,alias; do
	    AC_TRY_LINK([void foo(void) {}
		void bar(void) __attribute__(($a("foo")));], [bar()],
		[rb_cv_gcc_function_alias=$a; break])
	done])
    if test "$rb_cv_gcc_function_alias" = no; then
	AC_DEFINE([RUBY_ALIAS_FUNCTION(old_prot, new_name, args)],
		  [VALUE old_prot {return new_name args;}])
    else
	AC_DEFINE_UNQUOTED([RUBY_ALIAS_FUNCTION(old_prot, new_name, args)],
			   [VALUE old_prot __attribute__(($rb_cv_gcc_function_alias(@%:@new_name)));])
    fi
fi

AC_CACHE_CHECK([for RUBY_EXTERN], rb_cv_ruby_extern,
[rb_cv_ruby_extern=no
for mac in "__attribute__((dllimport))" "__declspec(dllimport)"; do
  AC_TRY_COMPILE(
    [extern $mac void conftest(void);],
    [rb_cv_ruby_extern="extern $mac"; break])
done])
test "x$rb_cv_ruby_extern" = xno || AC_DEFINE_UNQUOTED(RUBY_EXTERN, $rb_cv_ruby_extern)

XCFLAGS="$XCFLAGS -DRUBY_EXPORT"

dnl Check whether we need to define sys_nerr locally
AC_CHECK_DECLS([sys_nerr], [], [], [$ac_includes_default
#include <errno.h>])

case "$target_os" in
freebsd*)
  AC_CACHE_CHECK([whether pthread should be enabled by default],
    rb_cv_enable_pthread_default,
    [AC_TRY_CPP([
#include <osreldate.h>
#if __FreeBSD_version < 502102
#error pthread should be disabled on this platform
#endif
      ],
      rb_cv_enable_pthread_default=yes,
      rb_cv_enable_pthread_default=no)])
  enable_pthread_default=$rb_cv_enable_pthread_default
  ;;
mingw*)
  enable_pthread_default=no
  ;;
*)
  enable_pthread_default=yes
  ;;
esac

AC_ARG_ENABLE(pthread,
       [  --enable-pthread        use pthread library.],
       [enable_pthread=$enableval], [enable_pthread=$enable_pthread_default])

dnl Checks for libraries.
case "$target_os" in
nextstep*)	;;
openstep*)	;;
rhapsody*)	;;
darwin*)	LIBS="-lobjc $LIBS"
		CPPFLAGS="$CPPFLAGS -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE"
		AC_TRY_CPP([#include <AvailabilityMacros.h>
		    #if MAC_OS_X_VERSION_MAX_ALLOWED <= 1040
		    #error pre OS X 10.4
		    [!<===== pre OS X 10.4 =====>]
		    #endif
		    ],
		    [
		    test "x$target_cpu" = xppc && ac_cv_header_ucontext_h=no
		    ],
		    [
		    AC_DEFINE(BROKEN_SETREUID, 1)
		    AC_DEFINE(BROKEN_SETREGID, 1)
		    ])
		;;
hpux*)		LIBS="-lm $LIBS"
		ac_cv_c_inline=no;;
human*)		ac_cv_func_getpgrp_void=yes
		ac_cv_func_setitimer=no
		;;
beos*|haiku*)	ac_cv_func_link=no
		ac_cv_func_sched_yield=no
		ac_cv_func_pthread_attr_setinheritsched=no
		case "$target_os" in
		beos*) ac_cv_header_net_socket_h=yes;;
		haiku*) ac_cv_func_shutdown=no;;
		esac
		LIBS="$LIBS" # m lib is include in root under BeOS/Haiku
		;;
cygwin*)	;;
mingw*)		LIBS="-lshell32 -lws2_32 $LIBS"
		ac_cv_header_a_out_h=no
		ac_cv_header_pwd_h=no
		ac_cv_header_utime_h=no
		ac_cv_header_sys_ioctl_h=no
		ac_cv_header_sys_param_h=no
		ac_cv_header_sys_resource_h=no
		ac_cv_header_sys_select_h=no
		ac_cv_header_sys_time_h=no
		ac_cv_header_sys_times_h=no
		ac_cv_header_sys_socket_h=no
		ac_cv_func_times=yes
		ac_cv_func_waitpid=yes
		ac_cv_func_fsync=yes
		ac_cv_func_snprintf=yes
		ac_cv_func_vsnprintf=yes
		ac_cv_func_seekdir=yes
		ac_cv_func_telldir=yes
		ac_cv_func_isinf=yes
		ac_cv_func_isnan=yes
		ac_cv_func_finite=yes
		ac_cv_func_link=yes
		ac_cv_func_truncate=yes
		ac_cv_func_fseeko=yes
		ac_cv_func_ftello=yes
		ac_cv_lib_crypt_crypt=no
		ac_cv_func_getpgrp_void=no
		ac_cv_func_setpgrp_void=yes
		ac_cv_func_memcmp_working=yes
		ac_cv_lib_dl_dlopen=no
		rb_cv_binary_elf=no
		rb_cv_negative_time_t=no
		ac_cv_func_fcntl=yes
		;;
os2-emx*)	LIBS="-lm $LIBS"
		ac_cv_lib_dir_opendir=no;;
msdosdjgpp*)	LIBS="-lm $LIBS"
		ac_cv_func_getpgrp_void=yes
		ac_cv_func_setitimer=no
		ac_cv_sizeof_rlim_t=4
		ac_cv_func_fork=no
		ac_cv_func_setrlimit=no
		ac_cv_header_sys_socket_h=no
		;;
bsdi*)          LIBS="-lm $LIBS"
		AC_DEFINE(BROKEN_SETREUID, 1)
		AC_DEFINE(BROKEN_SETREGID, 1)
                ac_cv_sizeof_rlim_t=8;;
freebsd*)	LIBS="-lm $LIBS"
		AC_CACHE_CHECK([whether -lxpg4 has to be linked],
		  rb_cv_lib_xpg4_needed,
		  [AC_TRY_CPP([
#include <osreldate.h>
#if __FreeBSD_version < 400020 || \
   (__FreeBSD_version >= 500000 && __FreeBSD_version < 500005)
#error needs libxpg4
#endif
		   ],
		   rb_cv_lib_xpg4_needed=no,
		   rb_cv_lib_xpg4_needed=yes,
		   rb_cv_lib_xpg4_needed=yes)])
		if test "$rb_cv_lib_xpg4_needed" = yes; then
			AC_CHECK_LIB(xpg4, setlocale)
		fi
		;;
dragonfly*)	LIBS="-lm $LIBS"
		;;
bow)		ac_cv_func_setitimer=no
		;;
superux*)     ac_cv_func_setitimer=no
              ;;
*) LIBS="-lm $LIBS";;
esac
AC_CHECK_LIB(crypt, crypt)
AC_CHECK_LIB(dl, dlopen)	# Dynamic linking for SunOS/Solaris and SYSV
AC_CHECK_LIB(dld, shl_load)	# Dynamic linking for HP-UX
AC_CHECK_LIB(socket, socketpair)	# SunOS/Solaris
AC_CHECK_LIB(rt, clock_gettime)	# GNU/Linux

case "$target_cpu" in
alpha*)		case "$target_os"::"$GCC" in
		*::yes)	CFLAGS="-mieee $CFLAGS" ;;   # gcc
		osf*)   CFLAGS="-ieee $CFLAGS" ;;    # ccc
		esac ;;
esac

ac_cv_header_net_socket_h=${ac_cv_header_net_socket_h=no}
if test "$ac_cv_header_net_socket_h" = yes; then
    ac_cv_header_sys_socket_h=${ac_cv_header_sys_socket_h=no}
else
    ac_cv_header_sys_socket_h=${ac_cv_header_sys_socket_h=yes}
fi

dnl Checks for header files.
AC_HEADER_DIRENT
AC_HEADER_STDC
AC_HEADER_SYS_WAIT
AC_CHECK_HEADERS(stdlib.h string.h unistd.h limits.h sys/file.h sys/ioctl.h sys/syscall.h\
		 fcntl.h sys/fcntl.h sys/select.h sys/time.h sys/times.h sys/param.h\
		 syscall.h pwd.h grp.h a.out.h utime.h memory.h direct.h sys/resource.h \
		 sys/mkdev.h sys/utime.h xti.h netinet/in_systm.h float.h ieeefp.h pthread.h \
		 ucontext.h intrinsics.h langinfo.h locale.h sys/sendfile.h time.h \
		 net/socket.h sys/socket.h)

dnl Check additional types.
AC_CHECK_SIZEOF(rlim_t, 0, [
  #ifdef HAVE_SYS_TYPES_H
  # include <sys/types.h>
  #endif
  #ifdef HAVE_SYS_TIME_H
  # include <sys/time.h>
  #endif
  #ifdef HAVE_SYS_RESOURCE_H
  # include <sys/resource.h>
  #endif
  #ifdef HAVE_UNISTD_H
  # include <unistd.h>
  #endif
  #include <stdio.h>
])

dnl Checks for typedefs, structures, and compiler characteristics.
AC_TYPE_SIZE_T
AC_CHECK_SIZEOF(size_t, 0)
AC_CHECK_SIZEOF(ptrdiff_t, $ac_cv_sizeof_size_t)
AC_STRUCT_ST_BLKSIZE
AC_STRUCT_ST_BLOCKS
AC_STRUCT_ST_RDEV
AC_CHECK_MEMBERS([struct stat.st_atim])
AC_CHECK_MEMBERS([struct stat.st_atimespec])
AC_CHECK_MEMBERS([struct stat.st_atimensec])
AC_CHECK_MEMBERS([struct stat.st_mtim])
AC_CHECK_MEMBERS([struct stat.st_mtimespec])
AC_CHECK_MEMBERS([struct stat.st_mtimensec])
AC_CHECK_MEMBERS([struct stat.st_ctim])
AC_CHECK_MEMBERS([struct stat.st_ctimespec])
AC_CHECK_MEMBERS([struct stat.st_ctimensec])

AC_CHECK_TYPES([struct timespec], [], [], [@%:@ifdef HAVE_TIME_H
@%:@include <time.h>
@%:@endif])

AC_CHECK_TYPE(fd_mask, [AC_DEFINE(HAVE_RB_FD_INIT, 1)])

dnl RUBY_DEFINT TYPENAME, SIZE, [SIGNED-OR-UNSIGNED], [INCLUDES = DEFAULT-INCLUDES]
AC_DEFUN([RUBY_DEFINT], [dnl
AC_CACHE_CHECK([for $1], [rb_cv_type_$1],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT([$4])
typedef $1 t; int s = sizeof(t) == 42;])],
   [rb_cv_type_$1=yes],
   [case m4_bmatch([$2], [^[1-9][0-9]*$], $2, [$ac_cv_sizeof_]AS_TR_SH($2)) in
    "1") rb_cv_type_$1="m4_if([$3], [], [signed ], [$3 ])char";;
    "$ac_cv_sizeof_short") rb_cv_type_$1="m4_if([$3], [], [], [$3 ])short";;
    "$ac_cv_sizeof_int") rb_cv_type_$1="m4_if([$3], [], [], [$3 ])int";;
    "$ac_cv_sizeof_long") rb_cv_type_$1="m4_if([$3], [], [], [$3 ])long";;
    "$ac_cv_sizeof_long_long") rb_cv_type_$1="m4_if([$3], [], [], [$3 ])long long";;
    "$ac_cv_sizeof___int64") rb_cv_type_$1="m4_if([$3], [], [], [$3 ])__int64";;
    *) rb_cv_type_$1=no;;
    esac])])
if test "${rb_cv_type_$1}" != no; then
    AC_DEFINE([HAVE_]AS_TR_CPP($1), 1)
    test "${rb_cv_type_$1}" = yes || AC_DEFINE_UNQUOTED($1, [$rb_cv_type_$1])
fi
])

RUBY_DEFINT(int8_t, 1)
RUBY_DEFINT(uint8_t, 1, unsigned)
RUBY_DEFINT(int16_t, 2)
RUBY_DEFINT(uint16_t, 2, unsigned)
RUBY_DEFINT(int32_t, 4)
RUBY_DEFINT(uint32_t, 4, unsigned)
RUBY_DEFINT(int64_t, 8)
RUBY_DEFINT(uint64_t, 8, unsigned)
RUBY_DEFINT(int128_t, 16)
RUBY_DEFINT(uint128_t, 16, unsigned)
RUBY_DEFINT(intptr_t, void*)
RUBY_DEFINT(uintptr_t, void*, unsigned)
RUBY_DEFINT(ssize_t, size_t)	dnl may differ from int, so not use AC_TYPE_SSIZE_T.

AC_CACHE_CHECK(for stack end address, rb_cv_stack_end_address,
[rb_cv_stack_end_address=no
for addr in __libc_stack_end _SEND; do
  AC_TRY_LINK(
    [extern void *$addr;],
    [if (!$addr) return 1;],
    [rb_cv_stack_end_address="$addr"; break])
done])
if test $rb_cv_stack_end_address != no; then
  AC_DEFINE_UNQUOTED(STACK_END_ADDRESS, $rb_cv_stack_end_address)
fi

dnl Checks for library functions.
AC_TYPE_GETGROUPS
AC_TYPE_SIGNAL
case "${target_cpu}-${target_os}" in
powerpc-darwin*)
  AC_LIBSOURCES(alloca.c)
  AC_SUBST([ALLOCA], [\${LIBOBJDIR}alloca.${ac_objext}])
  AC_DEFINE(C_ALLOCA)
  AC_DEFINE_UNQUOTED(alloca, alloca)
  ;;
*)
  AC_FUNC_ALLOCA
  ;;
esac
AC_FUNC_MEMCMP

# http://sources.redhat.com/ml/libc-hacker/2005-08/msg00008.html
# Debian GNU/Linux Etch's libc6.1 2.3.6.ds1-13etch5 has this problem.
# Debian GNU/Linux Lenny's libc6.1 2.7-10 has no problem.
AC_CACHE_CHECK(for broken erfc of glibc-2.3.6 on IA64, rb_cv_broken_glibc_ia64_erfc,
  [AC_TRY_RUN([
#include <math.h>
int
main()
{
   erfc(10000.0);
   return 0;
}
],
	rb_cv_broken_glibc_ia64_erfc=no,
	rb_cv_broken_glibc_ia64_erfc=yes,
	rb_cv_broken_glibc_ia64_erfc=no)])
case $rb_cv_broken_glibc_ia64_erfc in
  yes) ac_cv_func_erf=no;;
esac

AC_REPLACE_FUNCS(dup2 memmove strerror\
		 strchr strstr crypt flock vsnprintf\
		 isnan finite isinf hypot acosh erf tgamma lgamma_r cbrt \
                 strlcpy strlcat)
AC_CHECK_FUNCS(fmod killpg wait4 waitpid fork spawnv syscall chroot fsync getcwd eaccess\
	      truncate ftruncate chsize times utimes utimensat fcntl lockf lstat\
	      link symlink readlink\
	      setitimer setruid seteuid setreuid setresuid setproctitle socketpair\
	      setrgid setegid setregid setresgid issetugid pause lchown lchmod\
	      getpgrp setpgrp getpgid setpgid initgroups getgroups setgroups\
	      getpriority getrlimit setrlimit sysconf group_member\
	      dlopen sigprocmask sigaction sigsetjmp _setjmp _longjmp vsnprintf snprintf\
	      setsid telldir seekdir fchmod cosh sinh tanh log2 round signbit\
	      setuid setgid daemon select_large_fdset setenv unsetenv\
              mktime timegm gmtime_r clock_gettime gettimeofday\
              pread sendfile shutdown)

AC_CACHE_CHECK(for __builtin_setjmp, ac_cv_func___builtin_setjmp,
[AC_TRY_LINK([@%:@include <setjmp.h>
    jmp_buf jb; void t(v) int v; {__builtin_longjmp(jb, v);}],
    [__builtin_setjmp(jb);],
    [ac_cv_func___builtin_setjmp=yes],
    [ac_cv_func___builtin_setjmp=no])
])

test x$ac_cv_func__longjmp = xno && ac_cv_func__setjmp=no

AC_MSG_CHECKING(for setjmp type)
AC_ARG_WITH(setjmp-type, 
	[  --with-setjmp-type      select setjmp type], [
	case $withval in
	__builtin_setjmp) setjmp_prefix=__builtin_;;
	_setjmp) setjmp_prefix=_;;
	sigsetjmp) setjmp_prefix=sig;;
	setjmp) setjmp_prefix=;;
	'') unset setjmp_prefix;;
	*)   AC_MSG_ERROR(invalid setjmp type: $withval);;
	esac], [unset setjmp_prefix])
if test ${setjmp_prefix+set}; then
    if test "${setjmp_prefix}" && eval test '$ac_cv_func_'${setjmp_prefix}setjmp = no; then
	AC_MSG_ERROR(${setjmp_prefix}setjmp is not available)
    fi
elif test "$ac_cv_func___builtin_setjmp" = yes; then
    setjmp_prefix=__builtin_
elif test "$ac_cv_func__setjmp" = yes; then
    setjmp_prefix=_
elif test "$ac_cv_func_sigsetjmp" = yes; then
    case $target_os in
    solaris*|cygwin*)
	setjmp_prefix=;;
    *)
	setjmp_prefix=sig;;
    esac
else
    setjmp_prefix=
fi
if test x$setjmp_prefix = xsig; then
    setjmp_sigmask=yes
else
    unset setjmp_sigmask
fi
AC_MSG_RESULT(${setjmp_prefix}setjmp)
AC_DEFINE_UNQUOTED([RUBY_SETJMP(env)], [${setjmp_prefix}setjmp(env${setjmp_sigmask+,0})])
AC_DEFINE_UNQUOTED([RUBY_LONGJMP(env,val)], [${setjmp_prefix}longjmp(env,val)])
AC_DEFINE_UNQUOTED(RUBY_JMP_BUF, ${setjmp_sigmask+${setjmp_prefix}}jmp_buf)

AC_ARG_ENABLE(setreuid,
       [  --enable-setreuid       use setreuid()/setregid() according to need even if obsolete.],
       [use_setreuid=$enableval])
if test "$use_setreuid" = yes; then
    AC_DEFINE(USE_SETREUID)
    AC_DEFINE(USE_SETREGID)
fi
AC_STRUCT_TIMEZONE
AC_CACHE_CHECK(for struct tm.tm_gmtoff, rb_cv_member_struct_tm_tm_gmtoff,
  [AC_TRY_COMPILE([#include <time.h>],
    [struct tm t; t.tm_gmtoff = 3600;],
  [rb_cv_member_struct_tm_tm_gmtoff=yes],
  [rb_cv_member_struct_tm_tm_gmtoff=no])])
if test "$rb_cv_member_struct_tm_tm_gmtoff" = yes; then
  AC_DEFINE(HAVE_STRUCT_TM_TM_GMTOFF)
fi
AC_CACHE_CHECK(for external int daylight, rb_cv_have_daylight,
  [AC_TRY_LINK([#include <time.h>
  int i;],
	[i = daylight;],
	rb_cv_have_daylight=yes,
	rb_cv_have_daylight=no)])
if test "$rb_cv_have_daylight" = yes; then
  AC_DEFINE(HAVE_DAYLIGHT)
fi
AC_DEFUN([RUBY_CHECK_VARTYPE], [dnl
AC_CACHE_CHECK([for external $1], rb_cv_var_$1,
  [rb_cv_var_$1=no
  AC_TRY_COMPILE([
#ifndef _XOPEN_SOURCE
#define _XOPEN_SOURCE 1
#endif
$2
;
const volatile void *volatile t;],
    [t = &(&$1)[0];],
    [for t in $3; do
      AC_TRY_COMPILE([
#ifndef _XOPEN_SOURCE
#define _XOPEN_SOURCE 1
#endif
$2
;
extern $t $1;
const volatile void *volatile t;],
        [t = &(&$1)[0];],
        [rb_cv_var_$1=$t; break])
    done])])
if test "[$rb_cv_var_]$1" != no; then
  AC_DEFINE([HAVE_VAR_]m4_toupper($1))
  AC_DEFINE_UNQUOTED([TYPEOF_VAR_]m4_toupper($1), $rb_cv_var_$1)
fi])
RUBY_CHECK_VARTYPE(timezone, [@%:@include <time.h>], [long int])
RUBY_CHECK_VARTYPE(altzone, [@%:@include <time.h>], [long int])
AC_CHECK_FUNCS(timezone)
if test "$ac_cv_func_timezone" = yes; then
  AC_CACHE_CHECK([whether timezone requires zero arguments], rb_cv_func_timezone_void,
    [AC_TRY_COMPILE([@%:@include <time.h>],
      [(void)timezone(0, 0);],
      [rb_cv_func_timezone_void=no],
      [rb_cv_func_timezone_void=yes])]
  )
  if test $rb_cv_func_timezone_void = yes; then
    AC_DEFINE(TIMEZONE_VOID)
  fi
fi

AC_CACHE_CHECK(for negative time_t for gmtime(3), rb_cv_negative_time_t,
  [AC_TRY_RUN([
#include <time.h>

void
check(tm, y, m, d, h, s)
    struct tm *tm;
    int y, m, d, h, s;
{
    if (!tm ||
	tm->tm_year != y ||
	tm->tm_mon  != m-1 ||
	tm->tm_mday != d ||
	tm->tm_hour != h ||
	tm->tm_sec  != s) {
	exit(1);
    }
}

int
main()
{
   time_t t = -1;
   struct tm *tm;

   check(gmtime(&t), 69, 12, 31, 23, 59);
   t = ~(time_t)0 << 31;
   check(gmtime(&t), 1, 12, 13, 20, 52);
   return 0;
}
],
	rb_cv_negative_time_t=yes,
	rb_cv_negative_time_t=no,
	rb_cv_negative_time_t=yes)])
if test "$rb_cv_negative_time_t" = yes; then
  AC_DEFINE(NEGATIVE_TIME_T)
fi

if test "$ac_cv_func_sigprocmask" = yes && test "$ac_cv_func_sigaction" = yes; then
   AC_DEFINE(POSIX_SIGNAL)
else
  AC_CHECK_FUNCS(sigsetmask)
  AC_CACHE_CHECK(for BSD signal semantics, rb_cv_bsd_signal,
    [AC_TRY_RUN([
#include <stdio.h>
#include <signal.h>

void
sig_handler(dummy)
     int dummy;
{
}

int
main()
{
  signal(SIGINT, sig_handler);
  kill(getpid(), SIGINT);
  kill(getpid(), SIGINT);
  return 0;
}
],
	rb_cv_bsd_signal=yes,
	rb_cv_bsd_signal=no,
	rb_cv_bsd_signal=$ac_cv_func_sigsetmask)])
  if test "$rb_cv_bsd_signal" = yes; then
    AC_DEFINE(BSD_SIGNAL)
  fi
fi

AC_FUNC_GETPGRP
AC_FUNC_SETPGRP  

AC_C_BIGENDIAN
AC_C_CONST
AC_C_CHAR_UNSIGNED
AC_C_INLINE
AC_C_VOLATILE

if test x"$target_cpu" = xia64; then
    AC_LIBOBJ([ia64])
    AC_CACHE_CHECK(for __libc_ia64_register_backing_store_base,
                   rb_cv___libc_ia64_register_backing_store_base,
    [rb_cv___libc_ia64_register_backing_store_base=no
    AC_TRY_LINK(
      [extern unsigned long __libc_ia64_register_backing_store_base;],
      [unsigned long p = __libc_ia64_register_backing_store_base;
       printf("%ld\n", p);],
      [rb_cv___libc_ia64_register_backing_store_base=yes])])
    if test $rb_cv___libc_ia64_register_backing_store_base = yes; then
      AC_DEFINE(HAVE___LIBC_IA64_REGISTER_BACKING_STORE_BASE)
    fi
fi

AC_CACHE_CHECK(whether right shift preserve sign bit, rb_cv_rshift_sign,
    [AC_COMPILE_IFELSE(AC_LANG_BOOL_COMPILE_TRY([], [(-1==(-1>>1))]),
	rb_cv_rshift_sign=yes,
	rb_cv_rshift_sign=no)])
if test "$rb_cv_rshift_sign" = yes; then
  AC_DEFINE(RSHIFT(x,y), ((x)>>(int)y))
else
  AC_DEFINE(RSHIFT(x,y), (((x)<0) ? ~((~(x))>>y) : (x)>>y))
fi

AC_MSG_CHECKING(read count field in FILE structures)
AC_CACHE_VAL(rb_cv_fcnt,
[for fcnt in	dnl
     _cnt	dnl
     __cnt	dnl
     _r		dnl
     readCount	dnl
     _rcount	dnl for emx0.9c
; do
    AC_TRY_COMPILE([#include <stdio.h>
],
	[FILE *f = stdin; f->$fcnt = 0;],
	rb_cv_fcnt="$fcnt"; break,
	rb_cv_fcnt="not found")
done])
if test "$rb_cv_fcnt" = "not found"; then
  AC_MSG_RESULT([not found(OK if using GNU libc)])
else
  AC_MSG_RESULT($rb_cv_fcnt)
  AC_DEFINE_UNQUOTED(FILE_COUNT, $rb_cv_fcnt)
fi

AC_MSG_CHECKING(read buffer ptr field in FILE structures)
AC_CACHE_VAL(rb_cv_frptr,
[for frptr in	dnl
     _IO_read_ptr dnl
     _ptr	dnl
     __ptr	dnl
     bufpos	dnl
     _p	dnl
; do
    AC_TRY_COMPILE([#include <stdio.h>
],
	[FILE *f = stdin; char buf[256]; f->$frptr = buf;],
	rb_cv_frptr="$frptr"; break,
	rb_cv_frptr="not found")
done])
if test "$rb_cv_frptr" = "not found"; then
  AC_MSG_RESULT([not found])
else
  AC_MSG_RESULT($rb_cv_frptr)
  AC_DEFINE_UNQUOTED(FILE_READPTR, $rb_cv_frptr)

  if test "$rb_cv_fcnt" = "not found"; then
    AC_MSG_CHECKING(read buffer end field in FILE structures)
    AC_CACHE_VAL(rb_cv_frend,
    [for frend in	dnl
         _IO_read_end	dnl
         bufread 	dnl
    ; do
        AC_TRY_COMPILE([#include <stdio.h>
    ],
	[FILE *f = stdin; char buf[256]; f->$frend = buf;],
	rb_cv_frend="$frend"; break,
	rb_cv_frend="not found")
    done])
    if test "$rb_cv_frend" = "not found"; then
      AC_MSG_RESULT([not found])
    else
      AC_MSG_RESULT($rb_cv_frend)
      AC_DEFINE_UNQUOTED(FILE_READEND, $rb_cv_frend)
    fi
  fi
fi

AC_CACHE_CHECK([whether st_ino is huge], rb_cv_huge_st_ino,
[AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([
#include <sys/stat.h>
struct stat test_stat;
], [sizeof(test_stat.st_ino)>sizeof(long)])],
rb_cv_huge_st_ino=yes,
rb_cv_huge_st_ino=no)
])
if test $rb_cv_huge_st_ino = yes; then
  AC_DEFINE(HUGE_ST_INO)
fi

if test "$ac_cv_func_sysconf" = yes; then
  AC_DEFUN([RUBY_CHECK_SYSCONF], [dnl
  AC_CACHE_CHECK([whether _SC_$1 is supported], rb_cv_have_sc_[]m4_tolower($1),
    [AC_TRY_COMPILE([#include <unistd.h>
      ],
      [_SC_$1 >= 0],
      rb_cv_have_sc_[]m4_tolower($1)=yes,
      rb_cv_have_sc_[]m4_tolower($1)=no)
    ])
  if test "$rb_cv_have_sc_[]m4_tolower($1)" = yes; then
    AC_DEFINE(HAVE__SC_$1)
  fi
  ])
  RUBY_CHECK_SYSCONF(CLK_TCK)
fi

case "$target_cpu" in
m68*|i?86|ia64|sparc*|alpha*) rb_cv_stack_grow_dir=-1;;
hppa*) rb_cv_stack_grow_dir=+1;;
esac
AC_CACHE_CHECK(stack growing direction, rb_cv_stack_grow_dir,
  [AC_TRY_RUN([
/* recurse to get rid of inlining */
static int
stack_growup_p(addr, n)
    volatile int *addr, n;
{
    volatile int end;
    if (n > 0)
	return *addr = stack_growup_p(addr, n - 1);
    else
	return (&end > addr);
}
int main()
{
    int x;
    return stack_growup_p(&x, 10);
}
], rb_cv_stack_grow_dir=-1, rb_cv_stack_grow_dir=+1, rb_cv_stack_grow_dir=0)])
AC_DEFINE_UNQUOTED(STACK_GROW_DIRECTION, $rb_cv_stack_grow_dir)

if test x"$enable_pthread" = xyes; then
    for pthread_lib in thr pthread pthreads c c_r root; do
	AC_CHECK_LIB($pthread_lib, pthread_kill,
		     rb_with_pthread=yes, rb_with_pthread=no)
	if test "$rb_with_pthread" = "yes"; then break; fi
    done
    if test x"$rb_with_pthread" = xyes; then
	AC_DEFINE(_REENTRANT)
	AC_DEFINE(_THREAD_SAFE)
	AC_DEFINE(HAVE_LIBPTHREAD)
	case $pthread_lib in
	c)
	    ;;
	root)
		;;
	c_r)
	    MAINLIBS="-pthread $MAINLIBS"
	    ;;
	*)
	    LIBS="-l$pthread_lib $LIBS"
	    ;;
	esac
    else
	AC_MSG_WARN("Don't know how to find pthread library on your system -- thread support disabled")
    fi
    AC_CHECK_FUNCS(nanosleep sched_yield pthread_attr_setinheritsched)
    if test x"$ac_cv_func_nanosleep" = xno; then
       AC_CHECK_LIB(rt, nanosleep)
       if test x"$ac_cv_lib_rt_nanosleep" = xyes; then
           AC_DEFINE(HAVE_NANOSLEEP)
       fi
    fi
fi
if test x"$ac_cv_header_ucontext_h" = xyes; then
    if test x"$rb_with_pthread" = xyes; then
	AC_CHECK_FUNCS(getcontext setcontext)
    fi
fi

if test "$ac_cv_func_fork" = "yes" -a "$rb_with_pthread" = "yes"; then
    AC_CACHE_CHECK([if fork works with pthread], rb_cv_fork_with_pthread,
	[AC_TRY_RUN([
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS 0
#endif
#ifndef EXIT_FAILURE
#define EXIT_FAILURE 1
#endif

void *
thread_func(void *dmy)
{
    return dmy;
}

int
use_threads(void)
{
    pthread_t tid;
    if (pthread_create(&tid, 0, thread_func, 0) != 0) {
	return -1;
    }
    if (pthread_join(tid, 0) != 0) {
	return -1;
    }
    return 0;
}

int
main(int argc, char *argv[])
{
    pid_t pid;
    if (use_threads()) return EXIT_FAILURE;
    pid = fork();

    if (pid) {
	int loc;
	sleep(1);
	if (waitpid(pid, &loc, WNOHANG) == 0) {
	    kill(pid, SIGKILL);
	    return EXIT_FAILURE;
	}
    }
    else {
	if (use_threads()) return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;
}],
	rb_cv_fork_with_pthread=yes,
	rb_cv_fork_with_pthread=no,
	rb_cv_fork_with_pthread=yes)])
    test x$rb_cv_fork_with_pthread = xyes || AC_DEFINE(CANNOT_FORK_WITH_PTHREAD)
fi

AC_CHECK_FUNCS(backtrace)

AC_ARG_WITH(valgrind,
        [  --with-valgrind         enable valgrind memcheck support.],
        [AC_CHECK_HEADERS(valgrind/memcheck.h)])

dnl wheather use dln_a_out or not
AC_ARG_WITH(dln-a-out, 
	[  --with-dln-a-out        use dln_a_out if possible], [
	case $withval in
	yes) with_dln_a_out=yes;;
	*)   with_dln_a_out=no;;
	esac], [with_dln_a_out=no])

AC_CACHE_CHECK(whether ELF binaries are produced, rb_cv_binary_elf,
[AC_TRY_LINK([],[], [
case "`head -1 conftest$EXEEXT | cat -e`" in
dnl (
'^?ELF'*)
    rb_cv_binary_elf=yes;;
dnl (
*)
    rb_cv_binary_elf=no;;
esac],
rb_cv_binary_elf=no)])

if test "$rb_cv_binary_elf" = yes; then
  AC_DEFINE(USE_ELF)
fi

case "$target_os" in
linux* | gnu* | k*bsd*-gnu | bsdi*)
    if test "$rb_cv_binary_elf" = no; then
	with_dln_a_out=yes
    else
	LDFLAGS="$LDFLAGS -rdynamic"
    fi;;
esac
LIBEXT=a

AC_SUBST(DLDFLAGS)dnl
AC_SUBST(ARCH_FLAG)dnl

AC_SUBST(STATIC)dnl
AC_SUBST(CCDLFLAGS)dnl
AC_SUBST(LDSHARED)dnl
AC_SUBST(LDSHAREDXX)dnl
AC_SUBST(DLEXT)dnl
AC_SUBST(DLEXT2)dnl
AC_SUBST(LIBEXT)dnl

STATIC=
: ${LIBPATHFLAG=' -L%s'}
: ${PATHFLAG=''}

if test "$with_dln_a_out" != yes; then
  rb_cv_dlopen=unknown
  AC_MSG_CHECKING(whether OS depend dynamic link works)
  if test "$GCC" = yes; then
    case "$target_os" in
    nextstep*)	CCDLFLAGS="$CCDLFLAGS -fno-common";;
    openstep*)	CCDLFLAGS="$CCDLFLAGS -fno-common";;
    rhapsody*)	CCDLFLAGS="$CCDLFLAGS -fno-common";;
    darwin*)	CCDLFLAGS="$CCDLFLAGS -fno-common";;
    human*|bsdi*|beos*|haiku*|cygwin*|mingw*|aix*|interix*) ;;
    *) CCDLFLAGS="$CCDLFLAGS -fPIC";;
    esac
  else
    case "$target_os" in
	hpux*)		CCDLFLAGS="$CCDLFLAGS +Z";;
	solaris*|irix*)	CCDLFLAGS="$CCDLFLAGS -KPIC" ;;
	sunos*)		CCDLFLAGS="$CCDLFLAGS -PIC" ;;
	esix*|uxpds*)   CCDLFLAGS="$CCDLFLAGS -KPIC" ;;
	*)		: ${CCDLFLAGS=""} ;;
    esac
  fi


  AC_ARG_ENABLE(rpath,
       [  --disable-rpath         embed run path into extension libraries.],
       [enable_rpath=$enableval], [enable_rpath="$rb_cv_binary_elf"])
  if test "$enable_rpath" = yes; then
    LIBPATHFLAG=" -L%1\$-s"
    RPATHFLAG=" ${linker_flag}-R%1\$-s"
  fi

  case "$target_os" in
	hpux*)		DLDFLAGS="$DLDFLAGS -E"
			: ${LDSHARED='ld -b'}
			XLDFLAGS="$XLDFLAGS -Wl,-E"
			: ${LIBPATHENV=SHLIB_PATH}
			if test "$rb_cv_prog_gnu_ld" = no; then
			    RPATHFLAG=' +b %1$-s'
			fi
			rb_cv_dlopen=yes;;
	solaris*) 	if test "$GCC" = yes; then
                          : ${LDSHARED='$(CC) -shared'}
			   if test "$rb_cv_prog_gnu_ld" = yes; then
			       LDFLAGS="$LDFLAGS -Wl,-E"
			   fi
			else
			   : ${LDSHARED='ld -G'}
			fi
			rb_cv_dlopen=yes;;
	sunos*) 	: ${LDSHARED='ld -assert nodefinitions'}
			rb_cv_dlopen=yes;;
	irix*)		: ${LDSHARED='ld -shared'}
			rb_cv_dlopen=yes;;
	sysv4*) 	: ${LDSHARED='ld -G'}
			rb_cv_dlopen=yes;;
        nto-qnx*)       : ${LDSHARED="qcc -shared"}
                        rb_cv_dlopen=yes ;;
	esix*|uxpds*) 	: ${LDSHARED="ld -G"}
			rb_cv_dlopen=yes ;;
	osf*) 		: ${LDSHARED="ld -shared -expect_unresolved \"*\""}
			rb_cv_dlopen=yes ;;
	bsdi3*) 	case "$CC" in
			*shlicc*)	: ${LDSHARED="$CC -r"}
					rb_cv_dlopen=yes ;;
			esac ;;
	linux* | gnu* | k*bsd*-gnu | netbsd* | bsdi*)
			: ${LDSHARED='${CC} -shared'}
			if test "$rb_cv_binary_elf" = yes; then
			    LDFLAGS="$LDFLAGS -Wl,-export-dynamic"
			fi
			rb_cv_dlopen=yes ;;
	interix*) 	: ${LDSHARED="$CC -shared"}
			XLDFLAGS="$XLDFLAGS -Wl,-E"
			LIBPATHFLAG=" -L%1\$-s"
			rb_cv_dlopen=yes ;;
	freebsd*|dragonfly*)       : ${LDSHARED="$CC -shared"}
			if test "$rb_cv_binary_elf" = yes; then
			    LDFLAGS="$LDFLAGS -rdynamic"
			    DLDFLAGS="$DLDFLAGS "'-Wl,-soname,$(.TARGET)'
			else
			  test "$GCC" = yes && test "$rb_cv_prog_gnu_ld" = yes || LDSHARED="ld -Bshareable"
			fi
			rb_cv_dlopen=yes ;;
	openbsd*) 	: ${LDSHARED="\$(CC) -shared ${CCDLFLAGS}"}
			if test "$rb_cv_binary_elf" = yes; then
			    LDFLAGS="$LDFLAGS -Wl,-E"
			fi
			rb_cv_dlopen=yes ;;
	nextstep*)	: ${LDSHARED='cc -r -nostdlib'}
			LDFLAGS="$LDFLAGS -u libsys_s"
			rb_cv_dlopen=yes ;;
	openstep*)	: ${LDSHARED='cc -dynamic -bundle -undefined suppress'}
			: ${LDFLAGS=""}
			rb_cv_dlopen=yes ;;
	rhapsody*)	: ${LDSHARED='cc -dynamic -bundle -undefined suppress'}
			: ${LDFLAGS=""}
			rb_cv_dlopen=yes ;;
	darwin*)	: ${LDSHARED='cc -dynamic -bundle -undefined suppress -flat_namespace'}
			: ${LDFLAGS=""}
			: ${LIBPATHENV=DYLD_LIBRARY_PATH}
			rb_cv_dlopen=yes ;;
        aix*)           if test "$GCC" = yes; then
			    : ${LDSHARED='$(CC) -shared'}
			else
			    : ${LDSHARED='$(CC)'}
			fi
			LDSHARED="$LDSHARED ${linker_flag}-G"
			DLDFLAGS='-eInit_$(TARGET)'
			XLDFLAGS="${linker_flag}-bE:ruby.imp ${linker_flag}-brtl"
			: ${ARCHFILE="ruby.imp"}
                        TRY_LINK='$(CC) $(LDFLAGS) -oconftest $(INCFLAGS) -I$(hdrdir) $(CPPFLAGS)'
                        TRY_LINK="$TRY_LINK"' $(CFLAGS) $(src) $(LIBPATH) $(LOCAL_LIBS) $(LIBS)'
			: ${LIBPATHENV=SHLIB_PATH}
			rb_cv_dlopen=yes ;;
	human*)		: ${DLDFLAGS=''}
			: ${LDSHARED=''}
			: ${LDFLAGS=''}
			: ${LINK_SO='ar cru $@ $(OBJS)'}
			rb_cv_dlopen=yes ;;
	beos*) 		case "$target_cpu" in
			  powerpc*)
			    : ${LDSHARED="ld -xms"}
			    DLDFLAGS="$DLDFLAGS "'-export Init_$(TARGET) -lbe -lroot glue-noinit.a init_term_dyn.o start_dyn.o'
                            ;;
			  i586*)
			    : ${LDSHARED="ld -shared"}
			    DLDFLAGS="$DLDFLAGS -L/boot/develop/lib/x86 -lbe -lroot"
			    ;;
			esac
			: ${LIBPATHENV=LIBRARY_PATH}
			rb_cv_dlopen=yes ;;
	haiku*) 		case "$target_cpu" in
			  powerpc*)
			    : ${LDSHARED="ld -xms"}
			    DLDFLAGS="$DLDFLAGS "'-export Init_$(TARGET) -lbe -lroot glue-noinit.a init_term_dyn.o start_dyn.o'
                            ;;
			  i586*)
			    : ${LDSHARED="ld -shared"}
			    DLDFLAGS="$DLDFLAGS -L/boot/develop/lib/x86 -lbe -lroot"
			    ;;
			esac
			: ${LIBPATHENV=LIBRARY_PATH}
			rb_cv_dlopen=yes ;;
	nto-qnx*)	DLDFLAGS="$DLDFLAGS -L/lib -L/usr/lib -L/usr/local/lib"
			: ${LDSHARED='ld -Bshareable -x'}
			LDFLAGS="$LDFLAGS -L/lib -L/usr/lib -L/usr/local/lib"
			rb_cv_dlopen=yes;;
	cygwin*|mingw*)	: ${LDSHARED="${CC} -shared -s"}
			XLDFLAGS="$XLDFLAGS -Wl,--stack,0x00200000"
			DLDFLAGS="${DLDFLAGS} -Wl,--enable-auto-image-base,--enable-auto-import,--export-all"
			: ${LIBPATHENV=""}
			rb_cv_dlopen=yes ;;
	hiuxmpp)	: ${LDSHARED='ld -r'} ;;
	atheos*) 	: ${LDSHARED="$CC -shared"}
			rb_cv_dlopen=yes ;;
	os2-emx*)	LDFLAGS="$LDFLAGS -Zbsd-signals"
			;;
	*) 		: ${LDSHARED='ld'} ;;
  esac
  AC_MSG_RESULT($rb_cv_dlopen)
fi
if test "${LDSHAREDXX}" = ""; then
    case "${LDSHARED}" in
	*'$(CC)'*)
	    LDSHAREDXX=`echo "${LDSHARED}" | sed 's/\$(CC)/$(CXX)/'`
	    ;;
	*'${CC}'*)
	    LDSHAREDXX=`echo "${LDSHARED}" | sed 's/\${CC}/${CXX}/'`
	    ;;
	*$CC*)
	    LDSHAREDXX=`echo "${LDSHARED}" | sed "s|$CC|$CXX|"`
	    ;;
	ld" "*)
	    ;;
    esac
fi

AC_SUBST(LINK_SO)
AC_SUBST(LIBPATHFLAG)
AC_SUBST(RPATHFLAG)
AC_SUBST(LIBPATHENV, "${LIBPATHENV-LD_LIBRARY_PATH}")
AC_SUBST(TRY_LINK)

dln_a_out_works=no
if test "$ac_cv_header_a_out_h" = yes; then
  if test "$with_dln_a_out" = yes || test "$rb_cv_dlopen" = unknown; then
    cat confdefs.h > config.h
    AC_CACHE_CHECK(whether matz's dln works, rb_cv_dln_a_out,
    [AC_TRY_COMPILE([
#define USE_DLN_A_OUT
#include "dln.c"
],
	[], 
	rb_cv_dln_a_out=yes,
	rb_cv_dln_a_out=no)])
    if test "$rb_cv_dln_a_out" = yes; then
      dln_a_out_works=yes
      AC_DEFINE(USE_DLN_A_OUT)
    fi
  fi
fi

if test "$dln_a_out_works" = yes; then
  if test "$GCC" = yes; then
    STATIC=-static
  else
    STATIC=-Bstatic
  fi
  DLEXT=so
  CCDLFLAGS=
else
  case "$target_os" in
    hpux*)	DLEXT=sl;;
    nextstep*)	DLEXT=bundle;;
    openstep*)	DLEXT=bundle;;
    rhapsody*)	DLEXT=bundle;;
    darwin*)	DLEXT=bundle;;
    os2-emx*)	DLEXT=dll;;
    cygwin*|mingw*)	DLEXT=so;;
    *)		DLEXT=so;;
  esac
fi
len=2 # .rb
n=`expr "$DLEXT"  : '.*'`; test "$n" -gt "$len" && len=$n
n=`expr "$DLEXT2" : '.*'`; test "$n" -gt "$len" && len=$n
AC_DEFINE_UNQUOTED(DLEXT_MAXLEN, `expr $len + 1`)
test ".$DLEXT"  = "." || AC_DEFINE_UNQUOTED(DLEXT,  ".$DLEXT")
test ".$DLEXT2" = "." || AC_DEFINE_UNQUOTED(DLEXT2, ".$DLEXT2")
AC_SUBST(DLEXT)

AC_SUBST(STRIP)dnl
if test "$with_dln_a_out" = yes; then
  STRIP=true
else
  STRIP=strip
fi

case "$target_os" in
  linux* | gnu* | k*bsd*-gnu)
	STRIP='strip -S -x';;
  nextstep*)
	STRIP='strip -A -n';;
  openstep*)
	STRIP='strip -A -n';;
  rhapsody*)
	STRIP='strip -A -n';;
  darwin*)
	STRIP='strip -A -n';;
esac

EXTSTATIC=
AC_SUBST(EXTSTATIC)dnl
AC_ARG_WITH(static-linked-ext,
	    [  --with-static-linked-ext link external modules statically],
            [case $withval in
	     yes) STATIC=
		  EXTSTATIC=static;;
	     *)	;;
	     esac])

case "$target_os" in
  human*)
    AC_CHECK_LIB(signal, _harderr)
    AC_CHECK_LIB(hmem, hmemset)
    AC_CHECK_FUNCS(select)
    AC_CACHE_CHECK(whether PD libc _dtos18 fail to convert big number,
		   rb_cv_missing__dtos18,
    [AC_TRY_RUN(
changequote(<<, >>)dnl
<<
#include <stdio.h>
int
main()
{
   char buf[256];
   sprintf(buf, "%g", 1e+300);
   return (strcmp (buf, "1e+300") ? 0 : 1);
}
>>,
changequote([, ])dnl
rb_cv_missing__dtos18=yes, rb_cv_missing__dtos18=no, rb_cv_missing__dtos18=no)])
    if test "$rb_cv_missing__dtos18" = yes; then
      AC_DEFINE(MISSING__DTOS18)
    fi
    AC_CACHE_CHECK(whether PD libc fconvert fail to round,
		   rb_cv_missing_fconvert,
    [AC_TRY_RUN(
changequote(<<, >>)dnl
<<
#include <stdio.h>
#include <math.h>
int
main()
{
  char buf[256];
  sprintf(buf, "%f", log(exp(1.0)));
  return (strcmp (buf, "1.000000") ? 0 : 1);
}
>>,
changequote([, ])dnl
rb_cv_missing_fconvert=yes, rb_cv_missing_fconvert=no, rb_cv_missing_fconvert=no)])
    if test "$rb_cv_missing_fconvert" = yes; then
      AC_DEFINE(MISSING_FCONVERT)
    fi
    AC_LIBOBJ([x68.o])
    CFLAGS="$CFLAGS -fansi-only"
    XCFLAGS="$XCFLAGS -cc1-stack=262144 -cpp-stack=2694144"
    EXEEXT=.x
    OBJEXT=o
    setup=Setup.x68
    ;;
  dnl OS/2 environment w/ Autoconf 2.1x for EMX
  os2-emx)
    AC_LIBOBJ([os2])
    setup=Setup.emx
    ;;
  *djgpp*)
    setup=Setup.dj
    ;;
  *)
    setup=Setup
    ;;
esac

AC_SUBST(setup)

if test "$prefix" = NONE; then
  prefix=$ac_default_prefix
fi

#if test "$fat_binary" != no ; then
#  CFLAGS="$CFLAGS $ARCH_FLAG"
#fi

if test x"$cross_compiling" = xyes; then
  test x"$MINIRUBY" = x && MINIRUBY="${RUBY-ruby} -I`pwd` -rfake"
  PREP=fake.rb
  RUNRUBY='$(MINIRUBY) -I`cd $(srcdir)/lib; pwd`'
else
  MINIRUBY='./miniruby$(EXEEXT) -I$(srcdir)/lib'
  MINIRUBY="$MINIRUBY"' -I$(EXTOUT)/common -I./- -r$(srcdir)/ext/purelib.rb'
  PREP='miniruby$(EXEEXT)'
  RUNRUBY='$(MINIRUBY) $(srcdir)/runruby.rb --extout=$(EXTOUT)'
fi
AC_SUBST(MINIRUBY)
AC_SUBST(PREP)
AC_SUBST(RUNRUBY)
AC_SUBST(EXTOUT, [${EXTOUT=.ext}])

FIRSTMAKEFILE=""
LIBRUBY_A='lib$(RUBY_SO_NAME)-static.a'
LIBRUBY='$(LIBRUBY_A)'
LIBRUBYARG_STATIC='-l$(RUBY_SO_NAME)-static'
LIBRUBYARG='$(LIBRUBYARG_STATIC)'
SOLIBS=

case "$target_os" in
  cygwin*|mingw*|beos*|haiku*|openstep*|nextstep*|rhapsody*|darwin*|os2-emx*)
    : ${DLDLIBS=""}
    ;;
  *)
    DLDLIBS="$DLDLIBS -lc"
    ;;
esac

RUBY_SO_NAME='$(RUBY_INSTALL_NAME)'
LIBRUBY_LDSHARED=$LDSHARED
LIBRUBY_DLDFLAGS=$DLDFLAGS
LIBRUBY_SO='lib$(RUBY_SO_NAME).so.$(MAJOR).$(MINOR).$(TEENY)'
LIBRUBY_ALIASES='lib$(RUBY_SO_NAME).so'
ENABLE_SHARED=no

AC_ARG_ENABLE(shared,
       [  --enable-shared         build a shared library for Ruby. ],
       [enable_shared=$enableval])
if test "$enable_shared" = 'yes'; then
  LIBRUBY='$(LIBRUBY_SO)'
  LIBRUBYARG_SHARED='-l$(RUBY_SO_NAME)'
  LIBRUBYARG='$(LIBRUBYARG_SHARED)'
  CFLAGS="$CFLAGS $CCDLFLAGS"
  ENABLE_SHARED=yes
  if test "$rb_cv_binary_elf" = yes; then
    SOLIBS='$(LIBS)'
  fi
  case "$target_os" in
    sunos4*)
	LIBRUBY_ALIASES='lib$(RUBY_SO_NAME).so.$(MAJOR).$(MINOR) lib$(RUBY_SO_NAME).so'
	;;
    linux* | gnu* | k*bsd*-gnu | atheos*)
	LIBRUBY_DLDFLAGS='-Wl,-soname,lib$(RUBY_SO_NAME).so.$(MAJOR).$(MINOR)'
	LIBRUBY_ALIASES='lib$(RUBY_SO_NAME).so.$(MAJOR).$(MINOR) lib$(RUBY_SO_NAME).so'
	;;
    freebsd*|dragonfly*)
	SOLIBS='$(LIBS)'
	LIBRUBY_SO='lib$(RUBY_SO_NAME).so.$(MAJOR)$(MINOR)'
	if test "$rb_cv_binary_elf" != "yes" ; then
	    LIBRUBY_SO="$LIBRUBY_SO.\$(TEENY)"
	    LIBRUBY_ALIASES=''
	fi
	;;
    netbsd*)
	SOLIBS='$(LIBS)'
	LIBRUBY_SO='lib$(RUBY_SO_NAME).so.$(MAJOR)$(MINOR).$(TEENY)'
	LIBRUBY_DLDFLAGS='-Wl,-soname,lib$(RUBY_SO_NAME).so.$(MAJOR)$(MINOR)'
	if test "$rb_cv_binary_elf" = yes; then # ELF platforms
	   LIBRUBY_ALIASES='lib$(RUBY_SO_NAME).so.$(MAJOR)$(MINOR) lib$(RUBY_SO_NAME).so'
	else	# a.out platforms
	   LIBRUBY_ALIASES=""
	fi
	;;
    openbsd*)
	SOLIBS='$(LIBS)'
	LIBRUBY_SO='lib$(RUBY_INSTALL_NAME).so.$(MAJOR).'`expr ${MINOR} \* 10 + ${TEENY}`
	;;
    solaris*)
	SOLIBS='$(LIBS)'
	LIBRUBY_SO='lib$(RUBY_SO_NAME).so.$(MAJOR)'
	LIBRUBY_ALIASES='lib$(RUBY_SO_NAME).so.$(MAJOR).$(MINOR).$(TEENY) lib$(RUBY_SO_NAME).so'
	if test "$GCC" = yes; then
	    LIBRUBY_DLDFLAGS="$DLDFLAGS "'-Wl,-h,$(@F)'
	fi
	XLDFLAGS="$XLDFLAGS "'-R${libdir}'
	;;
    hpux*)
	XLDFLAGS="$XLDFLAGS "'-Wl,+s,+b,$(libdir)'
	LIBRUBY_SO='lib$(RUBY_SO_NAME).sl.$(MAJOR).$(MINOR).$(TEENY)'
	LIBRUBY_ALIASES='lib$(RUBY_SO_NAME).sl.$(MAJOR).$(MINOR) lib$(RUBY_SO_NAME).sl'
	;;
    aix*)
	LIBRUBY_DLDFLAGS="${linker_flag}-bnoentry $XLDFLAGS"
	LIBRUBYARG_SHARED='-L${libdir} -l${RUBY_SO_NAME}'
	SOLIBS='-lm -lc'
	;;
    beos*)
	case "$target_cpu" in
	powerpc*)
	    LIBRUBY_DLDFLAGS='-f ruby.exp -lnet -lbe -lroot glue-noinit.a init_term_dyn.o start_dyn.o'
	    ;;
	esac
	;;
    darwin*)
	LIBRUBY_SO='lib$(RUBY_SO_NAME).$(MAJOR).$(MINOR).$(TEENY).dylib'
	LIBRUBY_LDSHARED='cc -dynamiclib -undefined suppress -flat_namespace'
	LIBRUBY_DLDFLAGS='-install_name $(libdir)/lib$(RUBY_SO_NAME).dylib -current_version $(MAJOR).$(MINOR).$(TEENY) -compatibility_version $(MAJOR).$(MINOR)'
	LIBRUBY_ALIASES='lib$(RUBY_SO_NAME).$(MAJOR).$(MINOR).dylib lib$(RUBY_SO_NAME).dylib'
	;;
    interix*)
	LIBRUBYARG_SHARED='-L. -L${libdir} -l$(RUBY_SO_NAME)'
	;;
    *)
	;;
  esac
fi
if test "$enable_rpath" = yes; then
    LIBRUBYARG_SHARED="${linker_flag}-R ${linker_flag}\$(libdir) -L\$(libdir) $LIBRUBYARG_SHARED"
fi

LDFLAGS="-L. $LDFLAGS"
AC_SUBST(ARCHFILE)

dnl build rdoc index if requested
RDOCTARGET=""
AC_ARG_ENABLE(install-doc,
       [  --disable-install-doc    do not install rdoc indexes during install ],
       [install_doc=$enableval], [install_doc=yes])
if test "$install_doc" != no; then
   RDOCTARGET="install-doc"
fi
AC_SUBST(RDOCTARGET)

if test "$rb_with_pthread" = "yes"; then
    THREAD_MODEL=pthread
fi
MINIDLNOBJ=dln.o
case "$target_os" in
    linux*)
	;;
    netbsd*)
	CFLAGS="$CFLAGS -pipe"
	;;
    nextstep*|openstep*)
	# The -fno-common is needed if we wish to embed the Ruby interpreter
	# into a plugin module of some project (as opposed to embedding it
	# within the project's application).  The -I/usr/local/include is
	# needed because CPP as discovered by configure (cc -E -traditional)
	# fails to consult /usr/local/include by default.  This causes
	# mkmf.rb's have_header() to fail if the desired resource happens to be
	# installed in the /usr/local tree.
	CFLAGS="$CFLAGS -pipe -fno-common"
	CPPFLAGS="$CPPFLAGS -I/usr/local/include"
	;;
    rhapsody*)
	CFLAGS="$CFLAGS -pipe -no-precomp -fno-common"
	;;
    darwin*)
	CFLAGS="$CFLAGS -pipe -fno-common"
        MINIDLNOBJ=dmydln.o
	;;
    os2-emx)
	CFLAGS="$CFLAGS -DOS2 -Zmts"
	LIBRUBY_A=`echo $LIBRUBY_A | sed 's/^lib//'`
	LIBRUBY_SO=`echo $LIBRUBY_SO | sed 's/^lib//'`
	LIBRUBY_ALIASES=`for i in $LIBRUBY_ALIASES; do echo "$i"; done | sed 's/^lib//'`
	;;
    osf*)
	if test "$GCC" != "yes" ; then
	  # compile something small: taint.c is fine for this.
	  # the main point is the '-v' flag of 'cc'.
	  case "`cc -v -I. -c main.c -o /tmp/main.o 2>&1`" in
	  */gemc_cc*)   # we have the new DEC GEM CC
                        CFLAGS="$CFLAGS -oldc"
                        ;;
          *)            # we have the old MIPS CC
                        ;;
          esac
	  # cleanup
	  rm -f /tmp/main.o
	  CFLAGS="$CFLAGS -std"
	fi
	;;
    beos*)
	case "$target_cpu" in
	powerpc*)
	    CFLAGS="$CFLAGS -relax_pointers"
	    ;;
	esac
	;;
    cygwin*|mingw*)
	LIBRUBY_DLDFLAGS="${DLDFLAGS}"' -Wl,--out-implib=$(LIBRUBY)'
	case "$target_os" in
	cygwin*)
	    if test x"$enable_shared" = xyes; then
		LIBRUBY_SO='cyg$(RUBY_SO_NAME)'${MAJOR}${MINOR}${TEENY}.dll
	    fi
	    ;;
	mingw*)
	    RUBY_SO_NAME=${rb_cv_msvcrt}-'$(RUBY_INSTALL_NAME)'${MAJOR}${MINOR}${TEENY}
	    if test x"$enable_shared" = xyes; then
		LIBRUBY_SO='$(RUBY_SO_NAME)'.dll
		LIBRUBY_DLDFLAGS="${LIBRUBY_DLDFLAGS}"' $(RUBYDEF)'
	    fi
	    AC_LIBOBJ([win32])
	    COMMON_LIBS=m
#	    COMMON_MACROS="WIN32_LEAN_AND_MEAN="
	    COMMON_HEADERS="winsock2.h windows.h"
	    THREAD_MODEL=win32
	    ;;
	esac
	LIBRUBY_ALIASES=''
	FIRSTMAKEFILE=GNUmakefile:cygwin/GNUmakefile.in
	SOLIBS='$(LIBS)'
	if test x"$enable_shared" = xyes; then
	    LIBRUBY='lib$(RUBY_SO_NAME).dll.a'
	else
	    LIBRUBY_SO=dummy
	    LIBRUBY='lib$(RUBY_SO_NAME).a'
	    LIBRUBYARG='-l$(RUBY_SO_NAME)'
	fi
        MINIDLNOBJ=dmydln.o
	;;
    hpux*)
	case "$YACC" in
	  *yacc*)
	    XCFLAGS="$XCFLAGS -DYYMAXDEPTH=300"
	    YACC="$YACC -Nl40000 -Nm40000"
	    ;;
	esac
        MINIDLNOBJ=dmydln.o
	;;
    *msdosdjgpp*)
	FIRSTMAKEFILE=GNUmakefile:djgpp/GNUmakefile.in
	;;
    *)
	;;
esac
MINIOBJS="$MINIDLNOBJ"

case "$FIRSTMAKEFILE" in
dnl (
*GNUmakefile:*)
    gnumake=yes
    ;;
dnl (
*)
    AC_MSG_CHECKING([for if ${MAKE-make} is GNU make])
    mkdir conftest.dir
    echo "all:; @echo yes" > conftest.dir/GNUmakefile
    echo "all:; @echo no" > conftest.dir/Makefile
    gnumake=`(cd conftest.dir; ${MAKE-make})`
    rm -fr conftest.dir
    case "$gnumake" in
    dnl (
    *yes*)
	echo "include Makefile" > GNUmakefile
	echo "include uncommon.mk" >> GNUmakefile
	gnumake=yes;;
    dnl (
    *)
	gnumake=no;;
    esac
    AC_MSG_RESULT($gnumake)
    ;;
esac

CPPFLAGS="$CPPFLAGS "'$(DEFS)'
test -z "$CPPFLAGS" || CPPFLAGS="$CPPFLAGS "; CPPFLAGS="$CPPFLAGS"'${cppflags}'
cflagspat=`eval echo '"'"${cflags}"'"' | sed 's/[][|.*]/\\&/g'`
CFLAGS=`echo "$CFLAGS" | sed "s|$cflagspat"'|${cflags}|'`
cxxflagspat=`eval echo '"'"${cxxflags}"'"' | sed 's/[][|.*]/\\&/g'`
CXXFLAGS=`echo "$CXXFLAGS" | sed "s|$cxxflagspat"'|${cxxflags}|'`
AC_SUBST(cppflags, [])dnl
AC_SUBST(cflags, ['${optflags} ${debugflags} ${warnflags}'])dnl
AC_SUBST(optflags)dnl
AC_SUBST(debugflags)dnl
AC_SUBST(warnflags)dnl
AC_SUBST(XCFLAGS)dnl
AC_SUBST(XLDFLAGS)dnl
AC_SUBST(LIBRUBY_LDSHARED)
AC_SUBST(LIBRUBY_DLDFLAGS)
AC_SUBST(RUBY_INSTALL_NAME)
AC_SUBST(rubyw_install_name)
AC_SUBST(RUBYW_INSTALL_NAME)
AC_SUBST(RUBY_SO_NAME)
AC_SUBST(LIBRUBY_A)
AC_SUBST(LIBRUBY_SO)
AC_SUBST(LIBRUBY_ALIASES)
AC_SUBST(LIBRUBY)
AC_SUBST(LIBRUBYARG)
AC_SUBST(LIBRUBYARG_STATIC)
AC_SUBST(LIBRUBYARG_SHARED)
AC_SUBST(SOLIBS)
AC_SUBST(DLDLIBS)
AC_SUBST(ENABLE_SHARED)
AC_SUBST(MAINLIBS)
AC_SUBST(COMMON_LIBS)
AC_SUBST(COMMON_MACROS)
AC_SUBST(COMMON_HEADERS)
AC_SUBST(EXPORT_PREFIX)
AC_SUBST(MINIOBJS)
AC_SUBST(THREAD_MODEL)

MAKEFILES="Makefile `echo $FIRSTMAKEFILE | sed 's/:.*//'`"
MAKEFILES="`echo $MAKEFILES`"
AC_SUBST(MAKEFILES)

ri_prefix=
test "$program_prefix" != NONE &&
  ri_prefix=$program_prefix

ri_suffix=
test "$program_suffix" != NONE &&
  ri_suffix=$program_suffix

RUBY_INSTALL_NAME="${ri_prefix}ruby${ri_suffix}"
case "$target_os" in
  cygwin*|mingw*)
    RUBYW_INSTALL_NAME="${ri_prefix}rubyw${ri_suffix}"
    rubyw_install_name="$RUBYW_INSTALL_NAME"
    ;;
esac
RUBY_LIB_PREFIX=`eval echo \\"${libdir}/ruby\\"`

AC_ARG_WITH(ruby-version,
	    [  --with-ruby-version=STR ruby version string for version specific directories [[full]] (full|minor|STR)],
            [ruby_version=$withval],
            [ruby_version=full])
case "$ruby_version" in
  full)
    ruby_version="${MAJOR}.${MINOR}.${TEENY}"
    ;;
  minor)
    ruby_version="${MAJOR}.${MINOR}"
    ;;
esac

AC_ARG_WITH(sitedir,
	    [  --with-sitedir=DIR      site libraries in DIR [[LIBDIR/ruby/site_ruby]]],
            [sitedir=$withval],
            [sitedir='${libdir}/ruby/site_ruby'])
SITE_DIR=`eval echo \\"${sitedir}\\"`

AC_ARG_WITH(vendordir,
	    [  --with-vendordir=DIR    vendor libraries in DIR [[LIBDIR/ruby/vendor_ruby]]],
            [vendordir=$withval],
            [vendordir='${libdir}/ruby/vendor_ruby'])
VENDOR_DIR=`eval echo \\"${vendordir}\\"`

case "$target_os" in
  cygwin*|mingw*|*djgpp*|os2-emx*)
    RUBY_LIB_PREFIX="`eval echo "$RUBY_LIB_PREFIX" | sed 's|^NONE/|/|;s|^'"$prefix"'/|/|'`"
    RUBY_SITE_LIB_PATH="`eval echo "$SITE_DIR" | sed 's|^NONE/|/|;s|^'"$prefix"'/|/|'`"
    RUBY_VENDOR_LIB_PATH="`eval echo "$VENDOR_DIR" | sed 's|^NONE/|/|;s|^'"$prefix"'/|/|'`"
    ;;
  *)
    RUBY_LIB_PREFIX="`eval echo \\"$RUBY_LIB_PREFIX\\" | sed 's|^NONE/|'"$prefix"'/|'`"
    RUBY_SITE_LIB_PATH="`eval echo \\"$SITE_DIR\\" | sed 's|^NONE/|'"$prefix"'/|'`"
    RUBY_VENDOR_LIB_PATH="`eval echo \\"$VENDOR_DIR\\" | sed 's|^NONE/|'"$prefix"'/|'`"
    ;;
esac
RUBY_LIB_PATH="${RUBY_LIB_PREFIX}/${ruby_version}"
RUBY_SITE_LIB_PATH2="${RUBY_SITE_LIB_PATH}/${ruby_version}"
RUBY_VENDOR_LIB_PATH2="${RUBY_VENDOR_LIB_PATH}/${ruby_version}"

AC_DEFINE_UNQUOTED(RUBY_LIB, "${RUBY_LIB_PATH}")
AC_DEFINE_UNQUOTED(RUBY_SITE_LIB, "${RUBY_SITE_LIB_PATH}")
AC_DEFINE_UNQUOTED(RUBY_SITE_LIB2, "${RUBY_SITE_LIB_PATH2}")
AC_DEFINE_UNQUOTED(RUBY_VENDOR_LIB, "${RUBY_VENDOR_LIB_PATH}")
AC_DEFINE_UNQUOTED(RUBY_VENDOR_LIB2, "${RUBY_VENDOR_LIB_PATH2}")

AC_SUBST(arch)dnl
AC_SUBST(sitearch)dnl
AC_SUBST(ruby_version)dnl
AC_SUBST(sitedir)dnl
AC_SUBST(vendordir)dnl

configure_args=$ac_configure_args
AC_SUBST(configure_args)dnl

if test "$fat_binary" != no ; then
    arch="fat-${target_os}"

    AC_DEFINE_UNQUOTED(RUBY_THIN_ARCHLIB,
                 "${RUBY_LIB_PATH}/" __ARCHITECTURE__ "-${target_os}")

    AC_DEFINE_UNQUOTED(RUBY_SITE_THIN_ARCHLIB,
                 "${RUBY_SITE_LIB_PATH}/" __ARCHITECTURE__ "-${target_os}")
    AC_DEFINE_UNQUOTED(RUBY_VENDOR_THIN_ARCHLIB,
                 "${RUBY_VENDOR_LIB_PATH}/" __ARCHITECTURE__ "-${target_os}")
    AC_DEFINE_UNQUOTED(RUBY_PLATFORM, __ARCHITECTURE__ "-${target_os}")
else
    arch="${target_cpu}-${target_os}"
    AC_DEFINE_UNQUOTED(RUBY_PLATFORM, "${arch}")
fi

case "$target_os" in
  mingw*) sitearch="$target_cpu-$rb_cv_msvcrt" ;;
  *) sitearch="${arch}" ;;
esac

AC_DEFINE_UNQUOTED(RUBY_ARCHLIB, "${RUBY_LIB_PATH}/${arch}")
AC_DEFINE_UNQUOTED(RUBY_SITE_ARCHLIB, "${RUBY_SITE_LIB_PATH2}/${sitearch}")
AC_DEFINE_UNQUOTED(RUBY_VENDOR_ARCHLIB, "${RUBY_VENDOR_LIB_PATH2}/${sitearch}")

AC_ARG_WITH(search-path,
		[  --with-search-path=DIR specify the additional search path],
		[search_path=$withval])
if test "$search_path" != ""; then
    AC_DEFINE_UNQUOTED(RUBY_SEARCH_PATH,"$search_path")
fi

AC_ARG_WITH(rubyhdrdir,
	    [  --with-ruby-hdrdir=DIR  core headers in DIR [INCLUDEDIR]],
	    [rubyhdrdir=$withval],
	    [rubyhdrdir='${includedir}/ruby-${ruby_version}'])

AC_ARG_WITH(sitehdrdir,
	    [  --with-site-hdrdir=DIR  core headers in DIR [INCLUDEDIR]],
	    [sitehdrdir=$withval],
	    [sitehdrdir='${rubyhdrdir}/site_ruby'])

AC_ARG_WITH(vendorhdrdir,
	    [  --with-vendor-hdrdir=DIR core headers in DIR [INCLUDEDIR]],
	    [vendorhdrdir=$withval],
	    [vendorhdrdir='${rubyhdrdir}/vendor_ruby'])

AC_SUBST(rubyhdrdir)dnl
AC_SUBST(sitehdrdir)dnl
AC_SUBST(vendorhdrdir)dnl

AC_ARG_WITH(mantype,
		[  --with-mantype=TYPE specify man page type; TYPE is one of man and doc],
		[
			case "$withval" in
			man|doc)
				MANTYPE=$withval
				;;
			*)
				AC_MSG_ERROR(invalid man type: $withval)
				;;
			esac
		])
if test -z "$MANTYPE"; then
	AC_PATH_PROGS(NROFF, nroff awf, /bin/false, "/usr/bin:/usr/ucb")
	if ${NROFF} -mdoc ${srcdir}/ruby.1 >/dev/null 2>&1; then
		MANTYPE=doc
	else
		MANTYPE=man
	fi
fi
AC_SUBST(MANTYPE)

arch_hdrdir="${EXTOUT}/include/${arch}/ruby"
$MAKEDIRS "${arch_hdrdir}"
config_h="${arch_hdrdir}/config.h"
if test -f "${config_h}" && tr -d '\015' < confdefs.h | cmp -s "${config_h}" -; then
  echo "config.h unchanged"
else
  echo "creating config.h"
  tr -d '\015' < confdefs.h > "${config_h}"
fi
tr -d '\015' < largefile.h > confdefs.h
rm largefile.h

BUILTIN_ENCS=["`sed -n -e '/^BUILTIN_ENCS[ 	]*=/{' \
	-e s/// -e :l -e '/\\\\$/N' -e 's/\\\\\\n/ /' -e 't l' -e p \
	-e '}' "${srcdir}/enc/Makefile.in"`"]
BUILTIN_ENCOBJS=
for e in $BUILTIN_ENCS; do BUILTIN_ENCOBJS="$BUILTIN_ENCOBJS `basename $e .c`"'.$(OBJEXT)'; done
AC_SUBST(BUILTIN_ENCOBJS)

BUILTIN_TRANSES=["`sed -n -e '/^BUILTIN_TRANSES[ 	]*=/{' \
	-e s/// -e :l -e '/\\\\$/N' -e 's/\\\\\\n/ /' -e 't l' -e p \
	-e '}' "${srcdir}/enc/Makefile.in"`"]
BUILTIN_TRANSSRCS=
BUILTIN_TRANSOBJS=
for e in $BUILTIN_TRANSES; do
  BUILTIN_TRANSSRCS="$BUILTIN_TRANSSRCS `basename $e .trans`"'.c';
  BUILTIN_TRANSOBJS="$BUILTIN_TRANSOBJS `basename $e .trans`"'.$(OBJEXT)';
done
AC_SUBST(BUILTIN_TRANSSRCS)
AC_SUBST(BUILTIN_TRANSOBJS)

AC_CONFIG_FILES($FIRSTMAKEFILE)
AC_CONFIG_FILES(Makefile, [{
	sed '/^MISSING/s/\$U\././g' Makefile
	echo; test x"$EXEEXT" = x || echo 'miniruby: miniruby$(EXEEXT)'
	test "$RUBY_INSTALL_NAME$EXEEXT" = ruby || echo 'ruby: $(PROGRAM);'
	if test "$gnumake" != yes; then
	    echo ['$(MKFILES): $(srcdir)/common.mk']
	    sed ['s/{\$([^(){}]*)[^{}]*}//g'] ${srcdir}/common.mk
	fi
      } >> confmk$$.tmp && mv -f confmk$$.tmp Makefile],
[RUBY_INSTALL_NAME=$RUBY_INSTALL_NAME EXEEXT=$EXEEXT gnumake=$gnumake])
AC_OUTPUT