Index: lib/gwp_asan/guarded_pool_allocator.cpp
===================================================================
--- lib/gwp_asan/guarded_pool_allocator.cpp
+++ lib/gwp_asan/guarded_pool_allocator.cpp
@@ -11,6 +11,9 @@
 #include "gwp_asan/options.h"
 
 #include <assert.h>
+#ifndef __STDC_FORMAT_MACROS
+	#define __STDC_FORMAT_MACROS 1
+#endif
 #include <inttypes.h>
 #include <stdio.h>
 #include <stdlib.h>