diff --git a/src/deps.h b/src/deps.h
index c711286..3cc8629 100644
--- a/src/deps.h
+++ b/src/deps.h
@@ -12,7 +12,7 @@
 #include <fcntl.h>
 #include <errno.h>
 #include <signal.h>
-#include <byteswap.h>
+#include "sbyteswap.h"
 #include <sys/types.h>
 // Networking
 #include <sys/socket.h>
diff --git a/src/sbyteswap.h b/src/sbyteswap.h
new file mode 100644
index 0000000..cd1daeb
--- /dev/null
+++ b/src/sbyteswap.h
@@ -0,0 +1,23 @@
+// a) As Mac OS X does not have byteswap.h
+// needed this for a c util I had used over the years on linux. 
+// did not find a solution to stopgap via macports, sadly, but this did the trick
+
+#if HAVE_BYTESWAP_H
+#include <byteswap.h>
+#else
+#define bswap_16(value) \
+((((value) & 0xff) << 8) | ((value) >> 8))
+
+#define bswap_32(value) \
+(((uint32_t)bswap_16((uint16_t)((value) & 0xffff)) << 16) | \
+(uint32_t)bswap_16((uint16_t)((value) >> 16)))
+
+#define bswap_64(value) \
+(((uint64_t)bswap_32((uint32_t)((value) & 0xffffffff)) \
+<< 32) | \
+(uint64_t)bswap_32((uint32_t)((value) >> 32)))
+#endif
+
+
+(b) change this line 357 to
+while((c = getopt(argc, argv, "hvi::o::p:k::")) != -1){