diff -Naur a/acinclude.m4 b/acinclude.m4
--- a/acinclude.m4	2010-09-01 09:30:36.000000000 -0400
+++ b/acinclude.m4	2011-07-09 23:57:49.734641040 -0400
@@ -805,8 +805,6 @@
 AC_DEFUN([CLEANUP],
 [
 	# CFLAGS/CXXFLAGS may well contain unwanted settings, so clear them.
-	CFLAGS=""
-	CXXFLAGS=""
 ])
 
 #########################