#ifdef __FreeBSD__
#include <machine/endian.h>
+
+#elif defined(__sun__)
+#include <sys/byteorder.h>
+
+#ifndef __BIG_ENDIAN
+#define __BIG_ENDIAN 4321
+#endif
+#ifndef __LITTLE_ENDIAN
+#define __LITTLE_ENDIAN 1234
+#endif
+
+#ifdef _LITTLE_ENDIAN
+#define __BYTE_ORDER __LITTLE_ENDIAN
+#endif
+
+#ifdef _BIG_ENDIAN
+#define __BYTE_ORDER __BIG_ENDIAN
+#endif
+
+#define LITTLE_ENDIAN __LITTLE_ENDIAN
+#define BIG_ENDIAN __BIG_ENDIAN
+#define BYTE_ORDER __BYTE_ORDER
+
+#define betoh16(x) BE_16(x)
+#define letoh16(x) LE_16(x)
+#define betoh32(x) BE_32(x)
+#define letoh32(x) LE_32(x)
+#define betoh64(x) BE_64(x)
+#define letoh64(x) LE_64(x)
+#define htobe16(x) BE_16(x)
+#define be16toh(x) BE_16(x)
+#define htobe32(x) BE_32(x)
+#define be32toh(x) BE_32(x)
+#define htobe64(x) BE_64(x)
+#define be64toh(x) BE_64(x)
+
+#elif defined(__MINGW32__)
+#ifndef __BIG_ENDIAN
+#define __BIG_ENDIAN 4321
+#endif
+#ifndef __LITTLE_ENDIAN
+#define __LITTLE_ENDIAN 1234
+#endif
+
+#ifndef __BYTE_ORDER
+#define __BYTE_ORDER __LITTLE_ENDIAN
+#endif
+
+#define LITTLE_ENDIAN __LITTLE_ENDIAN
+#define BIG_ENDIAN __BIG_ENDIAN
+#define PDP_ENDIAN __PDP_ENDIAN
+#define BYTE_ORDER __BYTE_ORDER
+
+#elif defined(__APPLE__)
+# include <machine/endian.h>
+# include <libkern/OSByteOrder.h>
+
+# if BYTE_ORDER == LITTLE_ENDIAN
+# define htobe16(x) OSSwapConstInt16(x)
+# define htole16(x) (x)
+# define be16toh(x) OSSwapConstInt16(x)
+# define le16toh(x) (x)
+
+# define htobe32(x) OSSwapConstInt32(x)
+# define htole32(x) (x)
+# define be32toh(x) OSSwapConstInt32(x)
+# define le32toh(x) (x)
+
+# define htobe64(x) OSSwapConstInt64(x)
+# define htole64(x) (x)
+# define be64toh(x) OSSwapConstInt64(x)
+# define le64toh(x) (x)
+
+# else /* BYTE_ORDER == LITTLE_ENDIAN */
+# define htobe16(x) (x)
+# define htole16(x) OSSwapConstInt16(x)
+# define be16toh(x) (x)
+# define le16toh(x) OSSwapConstInt16(x)
+
+# define htobe32(x) (x)
+# define htole32(x) OSSwapConstInt32(x)
+# define be32toh(x) (x)
+# define le32toh(x) OSSwapConstInt32(x)
+
+# define htobe64(x) (x)
+# define htole64(x) OSSwapConstInt64(x)
+# define be64toh(x) (x)
+# define le64toh(x) OSSwapConstInt64(x)
+# endif
+
#else
#include <endian.h>
-#endif
+
+/*
+ * htobe/betoh are not defined for glibc < 2.9, so add them explicitly
+ * if they are missing.
+ */
+# ifdef __USE_BSD
+/* Conversion interfaces. */
+# include <byteswap.h>
+
+# if __BYTE_ORDER == __LITTLE_ENDIAN
+# ifndef htobe16
+# define htobe16(x) __bswap_16(x)
+# endif
+# ifndef htole16
+# define htole16(x) (x)
+# endif
+# ifndef be16toh
+# define be16toh(x) __bswap_16(x)
+# endif
+# ifndef le16toh
+# define le16toh(x) (x)
+# endif
+
+# ifndef htobe32
+# define htobe32(x) __bswap_32(x)
+# endif
+# ifndef htole32
+# define htole32(x) (x)
+# endif
+# ifndef be32toh
+# define be32toh(x) __bswap_32(x)
+# endif
+# ifndef le32toh
+# define le32toh(x) (x)
+# endif
+
+# ifndef htobe64
+# define htobe64(x) __bswap_64(x)
+# endif
+# ifndef htole64
+# define htole64(x) (x)
+# endif
+# ifndef be64toh
+# define be64toh(x) __bswap_64(x)
+# endif
+# ifndef le64toh
+# define le64toh(x) (x)
+# endif
+
+# else /* __BYTE_ORDER == __LITTLE_ENDIAN */
+# ifndef htobe16
+# define htobe16(x) (x)
+# endif
+# ifndef htole16
+# define htole16(x) __bswap_16(x)
+# endif
+# ifndef be16toh
+# define be16toh(x) (x)
+# endif
+# ifndef le16toh
+# define le16toh(x) __bswap_16(x)
+# endif
+
+# ifndef htobe32
+# define htobe32(x) (x)
+# endif
+# ifndef htole32
+# define htole32(x) __bswap_32(x)
+# endif
+# ifndef be32toh
+# define be32toh(x) (x)
+# endif
+# ifndef le32toh
+# define le32toh(x) __bswap_32(x)
+# endif
+
+# ifndef htobe64
+# define htobe64(x) (x)
+# endif
+# ifndef htole64
+# define htole64(x) __bswap_64(x)
+# endif
+# ifndef be64toh
+# define be64toh(x) (x)
+# endif
+# ifndef le64toh
+# define le64toh(x) __bswap_64(x)
+# endif
+
+# endif /* __BYTE_ORDER == __LITTLE_ENDIAN */
+# endif /* __USE_BSD */
+#endif /* else -- __FreeBSD__ */
#ifndef FLOAT_WORD_ORDER
#ifdef __FLOAT_WORD_ORDER