The following patch allowed me to proceed for c,c++,lto,fortran,ada,objc,obj-c++
up to libada which has the same problem:
--- ../_clean/gcc/configure 2012-12-20 17:19:54.000000000 +0100
+++ ../p_work/gcc/configure 2012-12-21 23:44:46.000000000 +0100
@@ -10321,9 +10321,9 @@ $as_echo "#define HAVE_LANGINFO_CODESET
# We will need to find libiberty.h and ansidecl.h
saved_CFLAGS="$CFLAGS"
-CFLAGS="$CFLAGS -I${srcdir} -I${srcdir}/../include"
+CFLAGS="$CFLAGS -I${srcdir} -I${srcdir}/../include $GMPINC"
saved_CXXFLAGS="$CXXFLAGS"
-CXXFLAGS="$CXXFLAGS -I${srcdir} -I${srcdir}/../include"
+CXXFLAGS="$CXXFLAGS -I${srcdir} -I${srcdir}/../include $GMPINC"
for ac_func in getenv atol asprintf sbrk abort atof getcwd getwd \
strsignal strstr stpcpy strverscmp \
errno snprintf vsnprintf vasprintf malloc realloc calloc \
Dominique
