macifiy the build so that this compiles on a mac

src/crypto/equihash.cpp

@@ -21,6 +21,33 @@
 
 #include <boost/optional.hpp>
 
+#ifdef __APPLE__
+#include <machine/endian.h>
+#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)
+
+#define __BIG_ENDIAN    BIG_ENDIAN
+#define __LITTLE_ENDIAN LITTLE_ENDIAN
+#define __BYTE_ORDER    BYTE_ORDER
+#else
+#include 
+#include 
+#endif
+
 EhSolverCancelledException solver_cancelled;
 
 template<unsigned int N, unsigned int K>