--- a/m4/lib-prefix.m4
+++ b/m4/lib-prefix.m4
@@ -1,4 +1,4 @@
-# lib-prefix.m4 serial 4 (gettext-0.14.2)
+# lib-prefix.m4 serial 5 (gettext-0.15)
 dnl Copyright (C) 2001-2005 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -24,6 +24,7 @@
   AC_BEFORE([$0], [AC_LIB_LINKFLAGS])
   AC_REQUIRE([AC_PROG_CC])
   AC_REQUIRE([AC_CANONICAL_HOST])
+  AC_REQUIRE([AC_LIB_PREPARE_MULTILIB])
   AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
   dnl By default, look in $includedir and $libdir.
   use_additional=yes
@@ -45,7 +46,7 @@
         ])
       else
         additional_includedir="$withval/include"
-        additional_libdir="$withval/lib"
+        additional_libdir="$withval/$acl_libdirstem"
       fi
     fi
 ])
@@ -87,7 +88,7 @@
     dnl   2. if it's already present in $LDFLAGS,
     dnl   3. if it's /usr/local/lib and we are using GCC on Linux,
     dnl   4. if it doesn't exist as a directory.
-    if test "X$additional_libdir" != "X/usr/lib"; then
+    if test "X$additional_libdir" != "X/usr/$acl_libdirstem"; then
       haveit=
       for x in $LDFLAGS; do
         AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
@@ -97,7 +98,7 @@
         fi
       done
       if test -z "$haveit"; then
-        if test "X$additional_libdir" = "X/usr/local/lib"; then
+        if test "X$additional_libdir" = "X/usr/local/$acl_libdirstem"; then
           if test -n "$GCC"; then
             case $host_os in
               linux*) haveit=yes;;
@@ -151,3 +152,34 @@
   exec_prefix="$acl_save_exec_prefix"
   prefix="$acl_save_prefix"
 ])
+
+dnl AC_LIB_PREPARE_MULTILIB creates a variable acl_libdirstem, containing
+dnl the basename of the libdir, either "lib" or "lib64".
+AC_DEFUN([AC_LIB_PREPARE_MULTILIB],
+[
+  dnl There is no formal standard regarding lib and lib64. The current
+  dnl practice is that on a system supporting 32-bit and 64-bit instruction
+  dnl sets or ABIs, 64-bit libraries go under $prefix/lib64 and 32-bit
+  dnl libraries go under $prefix/lib. We determine the compiler's default
+  dnl mode by looking at the compiler's library search path. If at least
+  dnl of its elements ends in /lib64 or points to a directory whose absolute
+  dnl pathname ends in /lib64, we assume a 64-bit ABI. Otherwise we use the
+  dnl default, namely "lib".
+  acl_libdirstem=lib
+  searchpath=`(LC_ALL=C $CC -print-search-dirs) 2>/dev/null | sed -n -e 's,^libraries: ,,p' | sed -e 's,^=,,'`
+  if test -n "$searchpath"; then
+    acl_save_IFS="${IFS= 	}"; IFS=":"
+    for searchdir in $searchpath; do
+      if test -d "$searchdir"; then
+        case "$searchdir" in
+          */lib64/ | */lib64 ) acl_libdirstem=lib64 ;;
+          *) searchdir=`cd "$searchdir" && pwd`
+             case "$searchdir" in
+               */lib64 ) acl_libdirstem=lib64 ;;
+             esac ;;
+        esac
+      fi
+    done
+    IFS="$acl_save_IFS"
+  fi
+])