--- acinclude.m4
+++ acinclude.m4
@@ -10,10 +10,13 @@
 dnl may have different results.
 ac_lib_var=`echo $1['_']$2 | sed 'y%./+-%__p_%'`
 AC_CACHE_VAL(ac_cv_lib_static_$ac_lib_var,
+if test ! -z `grep 64 $libdir; then 
+  libsuffix=64
+fi
 if test -r /etc/ld.so.conf ; then
-  ld_so_paths="/lib /usr/lib `cat /etc/ld.so.conf`"
+  ld_so_paths="/lib${libsuffix} /usr/lib${libsuffix} `cat /etc/ld.so.conf`"
 else
-  ld_so_paths="/lib /usr/lib"
+  ld_so_paths="/lib${libsuffix} /usr/lib${libsuffix}"
 fi
 for path in $ld_so_paths; do
   [ac_save_LIBS="$LIBS"