--- gcc-3.4.6/gcc/configure	2013-05-19 20:09:27.000000000 +0200
+++ gcc/configure	2013-05-19 20:23:32.000000000 +0200
@@ -1583,6 +1583,7 @@
 # Directories
 # -----------
 
+### begin-GG-local: local prefix
 # Specify the local prefix
 local_prefix=
 
@@ -1600,8 +1601,9 @@
 
 # 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
@@ -7258,7 +7260,7 @@
    # read() to the same fd.  The only system known to have a problem here
    # is VMS, where text files have record structure.
    case "$host_os" in
-     vms* | ultrix*)
+     vms* | ultrix* | amigaos*)
         gcc_cv_func_mmap_file=no ;;
      *)
         gcc_cv_func_mmap_file=yes;;
@@ -7282,7 +7284,7 @@
    # Systems known to be in this category are Windows (all variants),
    # VMS, and Darwin.
    case "$host_os" in
-     vms* | cygwin* | pe | mingw* | darwin* | ultrix* | hpux10* | hpux11.00)
+     vms* | cygwin* | pe | mingw* | darwin* | ultrix* | hpux10* | hpux11.00 | amigaos*)
         gcc_cv_func_mmap_dev_zero=no ;;
      *)
         gcc_cv_func_mmap_dev_zero=yes;;
@@ -7367,7 +7369,7 @@
    # above for use of /dev/zero.
    # Systems known to be in this category are Windows, VMS, and SCO Unix.
    case "$host_os" in
-     vms* | cygwin* | pe | mingw* | sco* | udk* )
+     vms* | cygwin* | pe | mingw* | sco* | udk* | amigaos*)
         gcc_cv_func_mmap_anon=no ;;
      *)
         gcc_cv_func_mmap_anon=yes;;
@@ -7762,6 +7764,12 @@
 
   sparc_address_test (0);
 
+#ifdef __amigaos__
+  /* Force this test to succeed for AmigaOS, which has a fairly good
+     vfork() emulation, but doesn't support fork() at all.  -fnf */
+  exit (0);
+#endif
+
   child = vfork ();
 
   if (child == 0) {