Index: m4/acx_64bit.m4
===================================================================
--- m4/acx_64bit.m4	(revision 2796)
+++ m4/acx_64bit.m4	(revision 2797)
@@ -4,7 +4,7 @@
 	AC_ARG_ENABLE(
 	        [64bit],
         	[AS_HELP_STRING([--enable-64bit],[enable 64-bit compiling])],
-	        [enable_64bit="yes"],
+	        [enable_64bit="${enableval}"],
 	        [enable_64bit="no"])
 
 	if test "x$enable_64bit" = "xyes"