--- gvpe/src/curve25519.C	2015/01/17 07:59:47	1.4
+++ gvpe/src/curve25519.C	2015/01/17 08:35:16	1.5
@@ -36,7 +36,12 @@
 
 #include "util.h"
 #include "curve25519.h"
+
+#if __GNUC__ >= 4 && __SIZEOF_LONG__ == 8
+#include "curve25519-donna-c64.c"
+#else
 #include "curve25519-donna.c"
+#endif
 
 static void
 curve25519_derive (const curve25519_key &a, curve25519_key &b)