--- l4common.h.org	2014-01-13 00:43:28.406867323 +0800
+++ l4common.h	2014-01-13 00:48:49.384892938 +0800
@@ -2,31 +2,39 @@
 #ifndef LBS_COMMON_H
 #define LBS_COMMON_H
 
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
 #include <stddef.h>
 
 #ifdef __STDC_VERSION__
 # include <stdbool.h>
 # if __STDC_VERSION__ >= 201112L
 #  define LBS_COMMON_ISO_C11
-#  define LBS_COMMON_CHECK_TYPE(x,type) (_Generic ((x), type: (x)))
 # else
 #  define LBS_COMMON_ISO_C99
-#  define LBS_COMMON_CHECK_TYPE(x,type) (x)
 # endif
 #else
 # ifdef __cplusplus
 #  define LBS_COMMON_CXX
-#  define LBS_COMMON_CHECK_TYPE(x,type) (x)
 # else
 #  define bool  char
 #  define true  1
 #  define false 0
 #  define inline
 #  define LBS_COMMON_ISO_C89
-#  define LBS_COMMON_CHECK_TYPE(x,type) (x)
 # endif /* __cplusplus */
 #endif /* __STDC_VERSION__ */
 
+#ifdef HAVE_C__GENERIC
+# define LBS_COMMON_CHECK_TYPE(x,type) (_Generic ((x), type: (x)))
+#else
+# define LBS_COMMON_CHECK_TYPE(x,type) (x)
+#endif
+
+#include "memwrap.h"
+
 #define LBS_COMMON_NULL_PTR ((void*)NULL)
 #define LBS_COMMON_DEFINE_GETTER(ns,xt,m,mt) \
     static inline mt ns ## _get_ ## m (xt x) { \