diff --git a/aclocal.m4 b/aclocal.m4
index 2e6734a9440a..fc1d46a10865 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -4,7 +4,6 @@ dnl The contents of this file are under the Public Domain.
 dnl 
 
 builtin(include, build/autoconf/glib.m4)dnl
-builtin(include, build/autoconf/libIDL.m4)dnl
 builtin(include, build/autoconf/nspr.m4)dnl
 builtin(include, build/autoconf/nss.m4)dnl
 builtin(include, build/autoconf/pkg.m4)dnl
diff --git a/build/autoconf/libIDL.m4 b/build/autoconf/libIDL.m4
deleted file mode 100644
index ff2b666c96e6..000000000000
--- a/build/autoconf/libIDL.m4
+++ /dev/null
@@ -1,194 +0,0 @@
-# Configure paths for LIBIDL
-
-dnl AM_PATH_LIBIDL([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND [, MODULES]]]])
-dnl Test for LIBIDL, and define LIBIDL_CFLAGS and LIBIDL_LIBS
-dnl
-AC_DEFUN([AM_PATH_LIBIDL],
-[dnl 
-dnl Get the cflags and libraries from the libIDL-config script
-dnl
-AC_ARG_WITH(libIDL-prefix,[  --with-libIDL-prefix=PFX
-                          Prefix where libIDL is installed (optional)],
-            libIDL_config_prefix="$withval", libIDL_config_prefix="")
-AC_ARG_WITH(libIDL-exec-prefix,[  --with-libIDL-exec-prefix=PFX
-                          Exec prefix where libIDL is installed (optional)],
-            libIDL_config_exec_prefix="$withval", libIDL_config_exec_prefix="")
-AC_ARG_ENABLE(libIDLtest, [  --disable-libIDLtest    Do not try to compile and run a test libIDL program],
-		    , enable_libIDLtest=yes)
-
-  if test x$libIDL_config_exec_prefix != x ; then
-     libIDL_config_args="$libIDL_config_args --exec-prefix=$libIDL_config_exec_prefix"
-     if test x${HOST_LIBIDL_CONFIG+set} != xset ; then
-        HOST_LIBIDL_CONFIG=$libIDL_config_exec_prefix/bin/libIDL-config
-     fi
-  fi
-  if test x$libIDL_config_prefix != x ; then
-     libIDL_config_args="$libIDL_config_args --prefix=$libIDL_config_prefix"
-     if test x${HOST_LIBIDL_CONFIG+set} != xset ; then
-        HOST_LIBIDL_CONFIG=$libIDL_config_prefix/bin/libIDL-config
-     fi
-  fi
-
-  AM_PATH_GLIB(1.2.0)
-
-  dnl Force a version check to keep upgraded versions from being overridden by the cached value.
-  unset ac_cv_path_LIBIDL_CONFIG
-
-  AC_PATH_PROG(HOST_LIBIDL_CONFIG, libIDL-config, no)
-  min_libIDL_version=ifelse([$1], ,0.6.0,$1)
-  AC_MSG_CHECKING(for libIDL - version >= $min_libIDL_version)
-  no_libIDL=""
-  if test "$HOST_LIBIDL_CONFIG" = "no" ; then
-    no_libIDL=yes
-  else
-    HOST_LIBIDL_CFLAGS=`$HOST_LIBIDL_CONFIG $libIDL_config_args --cflags`
-    HOST_LIBIDL_LIBS=`$HOST_LIBIDL_CONFIG $libIDL_config_args --libs`
-    libIDL_config_major_version=`$HOST_LIBIDL_CONFIG $libIDL_config_args --version | \
-           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
-    libIDL_config_minor_version=`$HOST_LIBIDL_CONFIG $libIDL_config_args --version | \
-           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
-    libIDL_config_micro_version=`$HOST_LIBIDL_CONFIG $libIDL_config_args --version | \
-           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
-    if test "x$enable_libIDLtest" = "xyes" ; then
-      ac_save_CFLAGS="$CFLAGS"
-      ac_save_LIBS="$LIBS"
-      CFLAGS="$CFLAGS $HOST_LIBIDL_CFLAGS"
-      LIBS="$HOST_LIBIDL_LIBS $LIBS"
-dnl
-dnl Now check if the installed LIBIDL is sufficiently new.
-dnl
-      rm -f conf.libIDLtest
-      AC_TRY_RUN([
-#include <stdio.h>
-#include <stdlib.h>
-#include <libIDL/IDL.h>
-
-int 
-main ()
-{
-  int major, minor, micro;
-  int libIDL_major_version;
-  int libIDL_minor_version;
-  int libIDL_micro_version;
-  char *tmp_version;
-
-  system ("touch conf.libIDLtest");
-
-  /* HP/UX 9 (%@#!) writes to sscanf strings */
-  tmp_version = g_strdup ("$min_libIDL_version");
-  if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
-     printf("%s, bad version string\n", "$min_libIDL_version");
-     exit(1);
-  }
-  tmp_version = g_strdup (IDL_get_libver_string ());
-  if (sscanf(tmp_version, "%d.%d.%d",
-	     &libIDL_major_version,
-	     &libIDL_minor_version,
-	     &libIDL_micro_version) != 3) {
-     printf("%s, bad version string\n", tmp_version);
-     exit(1);
-  }
-
-  if ((libIDL_major_version != $libIDL_config_major_version) ||
-      (libIDL_minor_version != $libIDL_config_minor_version) ||
-      (libIDL_micro_version != $libIDL_config_micro_version))
-    {
-      printf("\n*** 'libIDL-config --version' returned %d.%d.%d, but libIDL (%d.%d.%d)\n", 
-             $libIDL_config_major_version, $libIDL_config_minor_version, $libIDL_config_micro_version,
-             libIDL_major_version, libIDL_minor_version, libIDL_micro_version);
-      printf ("*** was found! If libIDL-config was correct, then it is best\n");
-      printf ("*** to remove the old version of LIBIDL. You may also be able to fix the error\n");
-      printf("*** by modifying your LD_LIBRARY_PATH environment variable, or by editing\n");
-      printf("*** /etc/ld.so.conf. Make sure you have run ldconfig if that is\n");
-      printf("*** required on your system.\n");
-      printf("*** If libIDL-config was wrong, set the environment variable LIBIDL_CONFIG\n");
-      printf("*** to point to the correct copy of libIDL-config, and remove the file config.cache\n");
-      printf("*** before re-running configure\n");
-    } 
-  else if ((libIDL_major_version != LIBIDL_MAJOR_VERSION) ||
-	   (libIDL_minor_version != LIBIDL_MINOR_VERSION) ||
-           (libIDL_micro_version != LIBIDL_MICRO_VERSION))
-    {
-      printf("\n*** libIDL header files (version %d.%d.%d) do not match\n",
-	     LIBIDL_MAJOR_VERSION, LIBIDL_MINOR_VERSION, LIBIDL_MICRO_VERSION);
-      printf("*** library (version %d.%d.%d)\n",
-	     libIDL_major_version, libIDL_minor_version, libIDL_micro_version);
-    }
-  else
-    {
-      if ((libIDL_major_version > major) ||
-        ((libIDL_major_version == major) && (libIDL_minor_version > minor)) ||
-        ((libIDL_major_version == major) && (libIDL_minor_version == minor) && (libIDL_micro_version >= micro)))
-      {
-        return 0;
-       }
-     else
-      {
-        printf("\n*** An old version of libIDL (%d.%d.%d) was found.\n",
-               libIDL_major_version, libIDL_minor_version, libIDL_micro_version);
-        printf("*** You need at least libIDL version %d.%d.%d.\n",
-               major, minor, micro);
-        printf("***\n");
-        printf("*** If you have already installed a sufficiently new version, this error\n");
-        printf("*** probably means that the wrong copy of the libIDL-config shell script is\n");
-        printf("*** being found. The easiest way to fix this is to remove the old version\n");
-        printf("*** of libIDL, but you can also set the LIBIDL_CONFIG environment to point to the\n");
-        printf("*** correct copy of libIDL-config. (In this case, you will have to\n");
-        printf("*** modify your LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf\n");
-        printf("*** so that the correct libraries are found at run-time))\n");
-      }
-    }
-  return 1;
-}
-],, no_libIDL=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
-       CFLAGS="$ac_save_CFLAGS"
-       LIBS="$ac_save_LIBS"
-     fi
-  fi
-  if test "x$no_libIDL" = x ; then
-     AC_MSG_RESULT(yes)
-     ifelse([$2], , :, [$2])     
-  else
-     AC_MSG_RESULT(no)
-     if test "$HOST_LIBIDL_CONFIG" = "no" ; then
-       echo "*** The libIDL-config script installed by libIDL could not be found"
-       echo "*** If libIDL was installed in PREFIX, make sure PREFIX/bin is in"
-       echo "*** your path, or set the LIBIDL_CONFIG environment variable to the"
-       echo "*** full path to libIDL-config."
-     else
-       if test -f conf.libIDLtest ; then
-        :
-       else
-          echo "*** Could not run libIDL test program, checking why..."
-          CFLAGS="$CFLAGS $HOST_LIBIDL_CFLAGS"
-          LIBS="$LIBS $HOST_LIBIDL_LIBS"
-          AC_TRY_LINK([
-#include <stdio.h>
-#include <stdlib.h>
-#include <libIDL/IDL.h>
-],      [ return IDL_get_libver_string ? 1 : 0; ],
-        [ echo "*** The test program compiled, but did not run. This usually means"
-          echo "*** that the run-time linker is not finding libIDL or finding the wrong"
-          echo "*** version of LIBIDL. If it is not finding libIDL, you'll need to set your"
-          echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"
-          echo "*** to the installed location  Also, make sure you have run ldconfig if that"
-          echo "*** is required on your system"
-	  echo "***"
-          echo "*** If you have an old version installed, it is best to remove it, although"
-          echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH" ],
-        [ echo "*** The test program failed to compile or link. See the file config.log for the"
-          echo "*** exact error that occurred. This usually means libIDL was incorrectly installed"
-          echo "*** or that you have moved libIDL since it was installed. In the latter case, you"
-          echo "*** may want to edit the libIDL-config script: $LIBIDL_CONFIG" ])
-          CFLAGS="$ac_save_CFLAGS"
-          LIBS="$ac_save_LIBS"
-       fi
-     fi
-     HOST_LIBIDL_CFLAGS=""
-     HOST_LIBIDL_LIBS=""
-     ifelse([$3], , :, [$3])
-  fi
-  AC_SUBST(HOST_LIBIDL_CFLAGS)
-  AC_SUBST(HOST_LIBIDL_LIBS)
-  rm -f conf.libIDLtest
-])
diff --git a/config/autoconf.mk.in b/config/autoconf.mk.in
index 9b17f86f19e6..e8420f666945 100644
--- a/config/autoconf.mk.in
+++ b/config/autoconf.mk.in
@@ -400,10 +400,6 @@ HOST_LD		= @HOST_LD@
 HOST_RANLIB	= @HOST_RANLIB@
 HOST_BIN_SUFFIX	= @HOST_BIN_SUFFIX@
 
-HOST_LIBIDL_CONFIG = @HOST_LIBIDL_CONFIG@
-HOST_LIBIDL_CFLAGS = @HOST_LIBIDL_CFLAGS@
-HOST_LIBIDL_LIBS   = @HOST_LIBIDL_LIBS@
-
 HOST_OS_ARCH	= @HOST_OS_ARCH@
 host_cpu	= @host_cpu@
 host_vendor	= @host_vendor@
@@ -578,9 +574,6 @@ MOZ_ALSA_LIBS           = @MOZ_ALSA_LIBS@
 GLIB_CFLAGS	= @GLIB_CFLAGS@
 GLIB_LIBS	= @GLIB_LIBS@
 GLIB_GMODULE_LIBS	= @GLIB_GMODULE_LIBS@
-LIBIDL_CFLAGS = @LIBIDL_CFLAGS@
-LIBIDL_LIBS = @LIBIDL_LIBS@
-STATIC_LIBIDL = @STATIC_LIBIDL@
 
 MOZ_NATIVE_MAKEDEPEND	= @SYSTEM_MAKEDEPEND@
 
diff --git a/config/system-headers b/config/system-headers
index 825fe4a479f6..b4a585bcff84 100644
--- a/config/system-headers
+++ b/config/system-headers
@@ -308,7 +308,6 @@ hlink.h
 ia64/sys/inline.h
 Icons.h
 iconv.h
-IDL.h
 ieeefp.h
 ifaddrs.h
 image.h
@@ -404,7 +403,6 @@ libgnomevfs/gnome-vfs-mime-handlers.h
 libgnomevfs/gnome-vfs-mime-utils.h
 libgnomevfs/gnome-vfs-ops.h
 libgnomevfs/gnome-vfs-standard-callbacks.h
-libIDL/IDL.h
 lib$routines.h
 libnotify/notify.h
 limits
diff --git a/configure.in b/configure.in
index 7ae678407113..49046aa572e9 100644
--- a/configure.in
+++ b/configure.in
@@ -116,7 +116,6 @@ NSS_VERSION=3
 dnl Set the minimum version of toolkit libs used by mozilla
 dnl ========================================================
 GLIB_VERSION=1.2.0
-LIBIDL_VERSION=0.6.3
 PERL_VERSION=5.006
 PYTHON_VERSION=2.5
 CAIRO_VERSION=1.10
@@ -7831,207 +7830,8 @@ dnl =
 dnl ========================================================
 MOZ_ARG_HEADER(Standalone module options (Not for building Mozilla))
 
-dnl Check for GLib and libIDL.
+dnl Check for GLib.
 dnl ========================================================
-SKIP_IDL_CHECK="no"
-
-if test -z "$COMPILE_ENVIRONMENT"; then
-    SKIP_IDL_CHECK="yes"
-fi
-
-dnl = Allow users to disable libIDL checking for standalone modules
-MOZ_ARG_WITHOUT_BOOL(libIDL,
-[  --without-libIDL        Skip check for libIDL (standalone modules only)],
-	SKIP_IDL_CHECK="yes")
-
-if test -z "$CROSS_COMPILE"; then
-    if test -z "$HOST_LIBIDL_CONFIG"; then
-        HOST_LIBIDL_CONFIG="$LIBIDL_CONFIG"
-    fi
-    if test -z "$HOST_LIBIDL_PREFIX"; then
-        HOST_LIBIDL_PREFIX="$LIBIDL_PREFIX"
-    fi
-fi
-
-if test "$SKIP_IDL_CHECK" = "no"
-then
-    _LIBIDL_FOUND=
-    case "$host" in
-    *-mingw*)
-        if test -n "$GLIB_PREFIX"; then
-            _GLIB_PREFIX_DIR=`cd $GLIB_PREFIX && pwd -W`
-            if test "$?" = "0"; then
-                if test `echo ${PATH}: | grep -ic "$_GLIB_PREFIX_DIR/bin:"` = 0; then
-                    AC_MSG_ERROR([GLIB_PREFIX must be in your \$PATH.])
-                fi
-            else
-                 AC_MSG_ERROR([GLIB_PREFIX is set but "${GLIB_PREFIX}" is not a directory.])
-            fi
-        else
-            _GLIB_PREFIX_DIR=$MOZ_TOOLS_DIR
-        fi
-        if test ! -f "${_GLIB_PREFIX_DIR}/include/glib.h"; then
-            AC_MSG_ERROR([Cannot find $_GLIB_PREFIX_DIR/include/glib.h .])
-        fi
-        GLIB_CFLAGS="-I${_GLIB_PREFIX_DIR}/include"
-        if test -f "${_GLIB_PREFIX_DIR}/lib/glib-1.2_s.lib"; then
-            GLIB_LIBS="${_GLIB_PREFIX_DIR}/lib/glib-1.2_s.lib"
-        elif test -f "${_GLIB_PREFIX_DIR}/lib/glib-1.2.lib"; then
-            GLIB_LIBS="${_GLIB_PREFIX_DIR}/lib/glib-1.2.lib"
-        else
-            AC_MSG_ERROR([Cannot find $_GLIB_PREFIX_DIR/lib/glib-1.2.lib or $_GLIB_PREFIX_DIR/lib/glib-1.2_s.lib])
-        fi
-
-        if test -n "$HOST_LIBIDL_PREFIX"; then
-            _LIBIDL_PREFIX_DIR=`cd $HOST_LIBIDL_PREFIX && pwd -W`
-            if test "$?" = "0"; then
-                if test `echo ${PATH}: | grep -ic "$_LIBIDL_PREFIX_DIR/bin:"` = 0; then
-                    AC_MSG_ERROR([LIBIDL_PREFIX must be in your \$PATH.])
-                fi
-            else
-                AC_MSG_ERROR([LIBIDL_PREFIX is set but "${LIBIDL_PREFIX}" is not a directory.])
-            fi
-        else
-            _LIBIDL_PREFIX_DIR=$MOZ_TOOLS_DIR
-        fi
-        if test ! -f "${_LIBIDL_PREFIX_DIR}/include/libIDL/IDL.h"; then
-            AC_MSG_ERROR([Cannot find $_LIBIDL_PREFIX_DIR/include/libIDL/IDL.h .])
-        fi
-        HOST_LIBIDL_CFLAGS="-I${_LIBIDL_PREFIX_DIR}/include ${GLIB_CFLAGS}"
-        if test -f "${_LIBIDL_PREFIX_DIR}/lib/libidl-0.6_s.lib"; then
-            HOST_LIBIDL_LIBS="${_LIBIDL_PREFIX_DIR}/lib/libidl-0.6_s.lib"
-            STATIC_LIBIDL=1
-        elif test -f "${_LIBIDL_PREFIX_DIR}/lib/libidl-0.6.lib"; then
-            HOST_LIBIDL_LIBS="${_LIBIDL_PREFIX_DIR}/lib/libidl-0.6.lib"
-        else
-            AC_MSG_ERROR([Cannot find $_LIBIDL_PREFIX_DIR/lib/libidl-0.6.lib or $_LIBIDL_PREFIX_DIR/lib/libidl-0.6_s.lib])
-        fi
-        HOST_LIBIDL_LIBS="${HOST_LIBIDL_LIBS} ${GLIB_LIBS}"
-        _LIBIDL_FOUND=1
-        ;;
-    esac
-
-    if test -z "$_LIBIDL_FOUND"; then
-        if test "$MACOS_SDK_DIR"; then
-            dnl xpidl, and therefore libIDL, is only needed on the build host.
-            dnl Don't build it against the SDK, as that causes problems.
-            _MACSAVE_CFLAGS="$CFLAGS"
-            _MACSAVE_LIBS="$LIBS"
-            _MACSAVE_LDFLAGS="$LDFLAGS"
-            _MACSAVE_NEXT_ROOT="$NEXT_ROOT"
-          changequote(,)
-          CFLAGS=`echo $CFLAGS|sed -E -e "s%((-I|-isystem )${MACOS_SDK_DIR}/usr/(include|lib/gcc)[^ ]*)|-F${MACOS_SDK_DIR}(/System)?/Library/Frameworks[^ ]*|-nostdinc[^ ]*|-isysroot ${MACOS_SDK_DIR}%%g"`
-          LIBS=`echo $LIBS|sed -e "s?-L${MACOS_SDK_DIR}/usr/lib[^ ]*??g"`
-          LDFLAGS=`echo $LDFLAGS|sed -e "s?-Wl,-syslibroot,${MACOS_SDK_DIR}??g"`
-          changequote([,])
-          unset NEXT_ROOT
-        fi
-
-        PKG_CHECK_MODULES(HOST_LIBIDL, libIDL-2.0 >= 0.8.0 glib-2.0 gobject-2.0, _LIBIDL_FOUND=1,_LIBIDL_FOUND=)
-    fi
-
-    dnl if no gtk/libIDL1 or gtk2/libIDL2 combination was found, fall back
-    dnl to either libIDL1 or libIDL2.
-    if test -z "$_LIBIDL_FOUND"; then
-        AM_PATH_LIBIDL($LIBIDL_VERSION,_LIBIDL_FOUND=1)
-        if test -z "$_LIBIDL_FOUND"; then
-            PKG_CHECK_MODULES(HOST_LIBIDL, libIDL-2.0 >= 0.8.0,_LIBIDL_FOUND=1)
-        fi
-    fi
-    dnl
-    dnl If we don't have a libIDL config program & not cross-compiling,
-    dnl     look for orbit-config instead.
-    dnl
-    if test -z "$_LIBIDL_FOUND" -a -z "$CROSS_COMPILE"; then
-        MOZ_PATH_PROGS(ORBIT_CONFIG, $ORBIT_CONFIG orbit-config)
-        if test -n "$ORBIT_CONFIG"; then
-            AC_MSG_CHECKING([for ORBit libIDL usability])
-        	_ORBIT_CFLAGS=`${ORBIT_CONFIG} client --cflags`
-    	    _ORBIT_LIBS=`${ORBIT_CONFIG} client --libs`
-            _ORBIT_INC_PATH=`${PERL} -e '{ for $f (@ARGV) { print "$f " if ($f =~ m/^-I/); } }' -- ${_ORBIT_CFLAGS}`
-            _ORBIT_LIB_PATH=`${PERL} -e '{ for $f (@ARGV) { print "$f " if ($f =~ m/^-L/); } }' -- ${_ORBIT_LIBS}`
-            HOST_LIBIDL_CFLAGS="$_ORBIT_INC_PATH"
-            HOST_LIBIDL_LIBS="$_ORBIT_LIB_PATH -lIDL -lglib"
-            HOST_LIBIDL_CONFIG=
-            _SAVE_CFLAGS="$CFLAGS"
-            _SAVE_LIBS="$LIBS"
-            CFLAGS="$HOST_LIBIDL_CFLAGS $CFLAGS"
-            LIBS="$HOST_LIBIDL_LIBS $LIBS"
-            AC_TRY_RUN([
-#include <stdlib.h>
-#include <libIDL/IDL.h>
-int main() {
-  char *s;
-  s=strdup(IDL_get_libver_string());
-  if(s==NULL) {
-    exit(1);
-  }
-  exit(0);
-}
-            ], [_LIBIDL_FOUND=1
-                result="yes"],
-               [HOST_LIBIDL_CFLAGS=
-                HOST_LIBIDL_LIBS=
-                result="no"],
-               [_LIBIDL_FOUND=1
-                result="maybe"] )
-            AC_MSG_RESULT($result)
-            CFLAGS="$_SAVE_CFLAGS"
-            LIBS="$_SAVE_LIBS"
-        fi
-    fi
-    if test -z "$_LIBIDL_FOUND"; then
-        AC_MSG_ERROR([libIDL not found.
-        libIDL $LIBIDL_VERSION or higher is required.])
-    fi
-    if test "$MACOS_SDK_DIR"; then
-      CFLAGS="$_MACSAVE_CFLAGS"
-      LIBS="$_MACSAVE_LIBS"
-      LDFLAGS="$_MACSAVE_LDFLAGS"
-      if test -n "$_MACSAVE_NEXT_ROOT" ; then
-        export NEXT_ROOT="$_MACSAVE_NEXT_ROOT"
-      fi
-    fi
-fi
-
-if test -n "$CROSS_COMPILE"; then
-    case "$target" in
-    *-mingw*)
-        if test -n "$GLIB_PREFIX"; then
-            GLIB_CFLAGS="-I${GLIB_PREFIX}/include"
-            if test -f "${GLIB_PREFIX}/lib/glib-1.2_s.lib"; then
-                GLIB_LIBS="${GLIB_PREFIX}/lib/glib-1.2_s.lib"
-            elif test -f "${GLIB_PREFIX}/lib/glib-1.2.lib"; then
-                GLIB_LIBS="${GLIB_PREFIX}/lib/glib-1.2.lib"
-            else
-                AC_MSG_ERROR([Cannot find $GLIB_PREFIX/lib/glib-1.2.lib or $GLIB_PREFIX/lib/glib-1.2_s.lib])
-            fi
-        fi
-
-        if test -n "$LIBIDL_PREFIX"; then
-            LIBIDL_CFLAGS="-I${LIBIDL_PREFIX}/include ${GLIB_CFLAGS}"
-            if test -f "${LIBIDL_PREFIX}/lib/libIDL-0.6_s.lib"; then
-                LIBIDL_LIBS="${LIBIDL_PREFIX}/lib/libIDL-0.6_s.lib"
-                STATIC_LIBIDL=1
-            elif test -f "${LIBIDL_PREFIX}/lib/libIDL-0.6.lib"; then
-                LIBIDL_LIBS="${LIBIDL_PREFIX}/lib/libIDL-0.6.lib"
-            else
-                AC_MSG_ERROR([Cannot find $LIBIDL_PREFIX/lib/libIDL-0.6.lib or $LIBIDL_PREFIX/lib/libIDL-0.6_s.lib])
-            fi
-        fi
-        LIBIDL_LIBS="${LIBIDL_LIBS} ${GLIB_LIBS}"
-        ;;
-    *)
-        if test -n "LIBIDL_CONFIG" -a "LIBIDL_CONFIG" != "no"; then
-            LIBIDL_CFLAGS=`${LIBIDL_CONFIG} --cflags`
-            LIBIDL_LIBS=`${LIBIDL_CONFIG} --libs`
-        fi
-        ;;
-    esac
-else
-    LIBIDL_CFLAGS="$HOST_LIBIDL_CFLAGS"
-    LIBIDL_LIBS="$HOST_LIBIDL_LIBS"
-fi
 
 if test -z "$SKIP_PATH_CHECKS"; then
 if test -z "${GLIB_CFLAGS}" -o -z "${GLIB_LIBS}" ; then
@@ -8050,15 +7850,9 @@ if test -z "${GLIB_GMODULE_LIBS}" \
     GLIB_GMODULE_LIBS=`$GLIB_CONFIG gmodule --libs`
 fi
 
-AC_SUBST(LIBIDL_CFLAGS)
-AC_SUBST(LIBIDL_LIBS)
-AC_SUBST(STATIC_LIBIDL)
 AC_SUBST(GLIB_CFLAGS)
 AC_SUBST(GLIB_LIBS)
 AC_SUBST(GLIB_GMODULE_LIBS)
-AC_SUBST(HOST_LIBIDL_CONFIG)
-AC_SUBST(HOST_LIBIDL_CFLAGS)
-AC_SUBST(HOST_LIBIDL_LIBS)
 
 dnl ========================================================
 dnl Check for cairo
diff --git a/js/src/config/system-headers b/js/src/config/system-headers
index 825fe4a479f6..b4a585bcff84 100644
--- a/js/src/config/system-headers
+++ b/js/src/config/system-headers
@@ -308,7 +308,6 @@ hlink.h
 ia64/sys/inline.h
 Icons.h
 iconv.h
-IDL.h
 ieeefp.h
 ifaddrs.h
 image.h
@@ -404,7 +403,6 @@ libgnomevfs/gnome-vfs-mime-handlers.h
 libgnomevfs/gnome-vfs-mime-utils.h
 libgnomevfs/gnome-vfs-ops.h
 libgnomevfs/gnome-vfs-standard-callbacks.h
-libIDL/IDL.h
 lib$routines.h
 libnotify/notify.h
 limits