diff -urp rasmol-2.7.5-23Jul09/src/rasmol.h rasmol-2.7.5-23Jul09-64b/src/rasmol.h
--- rasmol-2.7.5-23Jul09/src/rasmol.h	2009-07-20 21:08:43.000000000 +0700
+++ rasmol-2.7.5-23Jul09-64b/src/rasmol.h	2013-02-22 14:40:00.378574163 +0700
@@ -125,6 +125,8 @@
 #define VECTOR_FAR 
 #endif
 
+#define _LONGLONG
+
 /*========================*/
 /*  Default User Options! */
 /*========================*/