Gentoo bug #458790
--- include/sasl.h	2012-10-12 17:05:48.000000000 +0300
+++ include/sasl.h	2013-02-23 16:56:44.648786268 +0200
@@ -121,6 +121,9 @@
 #ifndef SASL_H
 #define SASL_H 1
 
+/* stddef.h to get size_t defined */
+#include <stddef.h>
+
 /* Keep in sync with win32/common.mak */
 #define SASL_VERSION_MAJOR 2
 #define SASL_VERSION_MINOR 1
