--- ./a/malloc.h  2010-04-02 11:34:27.000000000 -0400
+++ ./b/malloc.h  2010-12-16 04:50:26.997050142 -0500
@@ -136,3 +136,3 @@
 #  include <unistd.h>
-#  define malloc_getpagesize sysconf(_SC_PAGESIZE)
+#  define malloc_getpagesize __getpagesize()
 #else /* just guess */