Patch pointed to by Ryan ARNOLD on the libc-help ML.
See: http://sourceware.org/ml/libc-help/2008-06/msg00063.html

Forwarded to crosstool-NG by Ioannis E. VENETIS:
See: http://sourceware.org/ml/libc-help/2008-06/msg00063.html

GCC 4.3 changed the location of some of the header files.  I don't
understand why you'd be getting these errors while building GCC since
it provides them.

With regard to GLIBC, Roland checked in some changes so that the GLIBC
build system could find the new locations of the GCC provided header
files.

diff -durN glibc-2.6.1.orig/configure.in glibc-2.6.1/configure.in
--- glibc-2.6.1.orig/configure.in	2007-06-08 05:16:36.000000000 +0200
+++ glibc-2.6.1/configure.in	2008-06-24 18:38:46.000000000 +0200
@@ -911,8 +911,12 @@
 # header directory and add that to the list.  NOTE: Only does the right
 # thing on a system that doesn't need fixincludes.  (Not presently a problem.)
 if test -n "$sysheaders"; then
-  ccheaders=`$CC -print-file-name=include`
-  SYSINCLUDES="-nostdinc -isystem $ccheaders \
+  SYSINCLUDES=-nostdinc
+  for d in include include-fixed; do
+    i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
+    SYSINCLUDES="$SYSINCLUDES -isystem $i"
+  done
+  SYSINCLUDES="$SYSINCLUDES \
 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
   if test -n "$CXX"; then
     cxxversion=`$CXX -dumpversion 2>&AS_MESSAGE_LOG_FD` &&
diff -durN glibc-2.6.1.orig/configure glibc-2.6.1/configure
--- glibc-2.6.1.orig/configure	2008-06-24 18:35:34.000000000 +0200
+++ glibc-2.6.1/configure	2008-06-24 18:38:46.000000000 +0200
@@ -4562,8 +4562,12 @@
 # header directory and add that to the list.  NOTE: Only does the right
 # thing on a system that doesn't need fixincludes.  (Not presently a problem.)
 if test -n "$sysheaders"; then
-  ccheaders=`$CC -print-file-name=include`
-  SYSINCLUDES="-nostdinc -isystem $ccheaders \
+  SYSINCLUDES=-nostdinc
+  for d in include include-fixed; do
+    i=`$CC -print-file-name="$d"` && test "x$i" != "x$d" &&
+    SYSINCLUDES="$SYSINCLUDES -isystem $i"
+  done
+  SYSINCLUDES="$SYSINCLUDES \
 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
   if test -n "$CXX"; then
     cxxversion=`$CXX -dumpversion 2>&5` &&
