Index: m4/ax_boost_base.m4
===================================================================
--- m4/ax_boost_base.m4.orig	2010-08-19 00:00:00.000000000 +0200
+++ m4/ax_boost_base.m4	2010-08-26 17:53:43.000000000 +0200
@@ -84,15 +84,18 @@ if test "x$want_boost" = "xyes"; then
     AC_MSG_CHECKING(for boostlib >= $boost_lib_version_req)
     succeeded=no
 
-    dnl On x86_64 systems check for system libraries in both lib64 and lib.
+    dnl On x86_64, ppc64 and s390x systems check for system libraries in both lib64 and lib.
     dnl The former is specified by FHS, but e.g. Debian does not adhere to
     dnl this (as it rises problems for generic multi-arch support).
     dnl The last entry in the list is chosen by default when no libraries
     dnl are found, e.g. when only header-only libraries are installed!
+
     libsubdirs="lib"
-    if test `uname -m` = x86_64; then
-        libsubdirs="lib64 lib lib64"
-    fi
+    case `uname -m` in
+        x86_64 | ppc64 | s390x)
+        	libsubdirs="lib64 lib lib64"
+        	;;
+    esac 
 
     dnl first we check the system location for boost libraries
     dnl this location ist chosen if boost libraries are installed with the --layout=system option