+
+/*
+ * 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 */
+