--- old/jdk/src/jdk.pack200/share/native/common-unpack/utils.h	2015-12-16 14:33:53.337356170 +0100
+++ new/jdk/src/jdk.pack200/share/native/common-unpack/utils.h	2015-12-16 14:33:53.173356167 +0100
@@ -32,6 +32,8 @@
 void mtrace(char c, void* ptr, size_t size);
 #endif
 
+// <math.h> may have defined OVERFLOW as a non-standard extension
+#undef OVERFLOW
 // overflow management
 #define OVERFLOW ((uint)-1)
 #define PSIZE_MAX (OVERFLOW/2)  /* normal size limit */