diff --git a/goldlib/gall/gcmpall.h b/goldlib/gall/gcmpall.h
index fcc0a6f..f5c6a7c 100644
--- a/goldlib/gall/gcmpall.h
+++ b/goldlib/gall/gcmpall.h
@@ -63,6 +63,11 @@
   #endif
 #endif
 
+#if !defined(__UNIX__)
+  #if defined(unix) || defined(__unix__) || defined(__unix)
+    #define __UNIX__
+  #endif
+#endif
 #if !defined(__UNIX__)
   #if defined(__linux__)
     #define __UNIX__ __linux__