check for sys/ioctl.h as well

added commented more aggressive compiler options for gcc, subject to be used
instead of the current ones when --enable-debug is used

configure.ac

@@ -849,6 +849,7 @@ AC_CHECK_HEADERS(
         sys/time.h \
         sys/select.h \
         sys/socket.h \
+        sys/ioctl.h \
         assert.h \
         unistd.h \
         malloc.h \
@@ -1013,6 +1014,9 @@ AC_HELP_STRING([--disable-debug],[Disable debug options]),
     CFLAGS="$CFLAGS -g" 
     if test "$GCC" = "yes"; then
        CFLAGS="$CFLAGS -W -Wall -Wwrite-strings -pedantic -Wno-long-long -Wundef -Wpointer-arith -Wnested-externs"
+
+       dnl here's a more aggressive set to use:
+       dnl CFLAGS="$CFLAGS -W -Wall -Wwrite-strings -pedantic -Wno-long-long -Wundef -Wpointer-arith -Wnested-externs -Wcast-align -Winline -Wstrict-prototypes -Wmissing-declarations -Wmissing-prototypes -Wshadow -Wfloat-equal -Wsign-compare -Wunreachable-code"
     fi
     dnl strip off optimizer flags
     NEWFLAGS=""