fix warning

diff --git a/crypto/bn/bn.h b/crypto/bn/bn.h
index 6213142e02d9d6e104bc24b3da43929fc6d6f62d..c423b65122dd9f4a9b2f37ae4b4a6b09f7340856 100644 (file)
--- a/crypto/bn/bn.h
+++ b/crypto/bn/bn.h
@@ -90,7 +90,9 @@ extern "C" {
  * be on.  Again this in only really a problem on machines
  * using "long long's", are 32bit, and are not using my assembler code. */
 #if defined(MSDOS) || defined(WINDOWS) || defined(WIN32) || defined(linux)
-#define BN_DIV2W
+# ifndef BN_DIV2W
+#  define BN_DIV2W
+# endif
 #endif
 
 /* assuming long is 64bit - this is the DEC Alpha