--- bswap.h.orig	2004-06-26 12:52:40.000000000 +0200
+++ bswap.h	2004-06-26 12:53:56.000000000 +0200
@@ -53,7 +53,7 @@
 #define B2N_32(x) x = swap32(x)
 #define B2N_64(x) x = swap64(x)
 
-#elif defined(__FreeBSD__) && __FreeBSD_version >= 470000
+#elif defined(__DragonFly__) || (__FreeBSD__) && __FreeBSD_version >= 470000
 #include <sys/endian.h>
 #define B2N_16(x) x = be16toh(x)
 #define B2N_32(x) x = be32toh(x)
