diff -Nur ocaml-3.08.4.orig/configure ocaml-3.08.4/configure
--- ocaml-3.08.4.orig/configure	2005-06-12 22:36:42.000000000 +0900
+++ ocaml-3.08.4/configure	2009-05-18 06:21:08.000000000 +0900
@@ -546,7 +546,7 @@
 # Further machine-specific hacks
 
 case "$host" in
-  ia64-*-linux*|alpha*-*-linux*|x86_64-*-linux*)
+  ia64-*-linux*|alpha*-*-linux*|x86_64-*-linux*|powerpc64-*-linux*)
     echo "Will use mmap() instead of malloc() for allocation of major heap chunks."
     echo "#define USE_MMAP_INSTEAD_OF_MALLOC" >> s.h;;
 esac