--- guile-1.6.0/libguile/gc_os_dep.c.unknown_arch	2002-07-08 11:09:32.000000000 -0400
+++ guile-1.6.0/libguile/gc_os_dep.c	2002-12-05 08:58:12.000000000 -0500
@@ -195,11 +195,11 @@
 #    define I386
 #    define mach_type_known
 # endif
-# if defined(LINUX) && (defined(__ia64__) || defined(__ia64))
+# if defined(LINUX) && (defined(__ia64__) || defined(__ia64)) || defined(__x86_64__)
 #    define IA64
 #    define mach_type_known
 # endif
-# if defined(LINUX) && defined(powerpc)
+# if defined(LINUX) && defined(powerpc) || defined(__s390__)
 #    define POWERPC
 #    define mach_type_known
 # endif