--- file_not_specified_in_diff	
+++ file_not_specified_in_diff	
@@ -, +, @@ 
--- engine/mem.h
+++ engine/mem.h
@@ -8,6 +8,8 @@ 
 #ifndef BJAM_MEM_H
 #define BJAM_MEM_H
 
+#include "jam.h"
+
 #ifdef OPT_BOEHM_GC
 
     /* Use Boehm GC memory allocator. */