added fixed to make on OSX El Capitan

eschalot.c

@@ -22,6 +22,25 @@
 /* Lets agree on 100 characters line limit, tab is 8 spaces long, second level ident is 4 spaces. */
 /* ---------- This wide ------------------------------------------------------------------------- */
 
+#ifdef __APPLE__
+  #include <libkern/OSByteOrder.h>
+
+  #define htobe16(x) OSSwapHostToBigInt16(x)
+  #define htole16(x) OSSwapHostToLittleInt16(x)
+  #define be16toh(x) OSSwapBigToHostInt16(x)
+  #define le16toh(x) OSSwapLittleToHostInt16(x)
+
+  #define htobe32(x) OSSwapHostToBigInt32(x)
+  #define htole32(x) OSSwapHostToLittleInt32(x)
+  #define be32toh(x) OSSwapBigToHostInt32(x)
+  #define le32toh(x) OSSwapLittleToHostInt32(x)
+
+  #define htobe64(x) OSSwapHostToBigInt64(x)
+  #define htole64(x) OSSwapHostToLittleInt64(x)
+  #define be64toh(x) OSSwapBigToHostInt64(x)
+  #define le64toh(x) OSSwapLittleToHostInt64(x)
+#endif  /* __APPLE__ */
+
 #ifdef __linux__
 # define _GNU_SOURCE
 # include <endian.h>