--- gcc-3.4.6/gcc/configure.ac	2013-05-19 20:09:27.000000000 +0200
+++ gcc/configure.ac	2013-05-19 20:23:32.000000000 +0200
@@ -101,10 +101,11 @@
 # Directories
 # -----------
 
+### begin-GG-local: local prefix
 # Specify the local prefix
 local_prefix=
 AC_ARG_WITH(local-prefix,
-[  --with-local-prefix=DIR specifies directory to put local include],
+[  --with-local-prefix=DIR specifies directory to put local include directory (not files).],
 [case "${withval}" in
 yes)	AC_MSG_ERROR(bad value ${withval} given for local include directory prefix) ;;
 no)	;;
@@ -113,8 +114,9 @@
 
 # Default local prefix if it is empty
 if test x$local_prefix = x; then
-	local_prefix=/usr/local
+	local_prefix='${prefix}'/local
 fi
+### end-GG-local
 
 # Don't set gcc_gxx_include_dir to gxx_include_dir since that's only
 # passed in by the toplevel make and thus we'd get different behavior
@@ -962,6 +964,8 @@
 
 gcc_AC_INITFINI_ARRAY
 
+AC_FUNC_ALLOCA
+
 # mkdir takes a single argument on some systems. 
 gcc_AC_FUNC_MKDIR_TAKES_ONE_ARG