diff -Naur Macaulay2-0.9.95.old/Macaulay2/e/comp.hpp Macaulay2-0.9.95/Macaulay2/e/comp.hpp
--- Macaulay2-0.9.95.old/Macaulay2/e/comp.hpp	2007-03-01 09:11:04.000000000 -0500
+++ Macaulay2-0.9.95/Macaulay2/e/comp.hpp	2007-03-01 09:12:09.000000000 -0500
@@ -4,7 +4,16 @@
 #define _comp_hpp_
 
 extern char system_interruptedFlag;
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
 extern int gbTrace;
+#if defined(__cplusplus)
+}
+#endif
+
+
 
 #include "engine.h"
 /* engine.h includes definitions of the stop conditions