Submitted upstream: <https://sourceforge.net/p/beecrypt/patches/13/>

diff --git a/blockmode.c b/blockmode.c
index 46d1fde..9998c23 100644
--- a/blockmode.c
+++ b/blockmode.c
@@ -29,6 +29,7 @@
 # include "config.h"
 #endif
 
+#include "beecrypt/endianness.h"
 #include "beecrypt/blockmode.h"
 
 int blockEncryptECB(const blockCipher* bc, blockCipherParam* bp, uint32_t* dst, const uint32_t* src, unsigned int nblocks)