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diff -ur a/src/common_interface.c b/src/common_interface.c
--- a/src/common_interface.c
+++ b/src/common_interface.c
@@ -51,6 +51,20 @@
# define HTOLE_32(x) (x)
#endif /* linux */
+#elif defined(__GNUC__) || defined(__clang__)
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+# define LETOH_16(x) __builtin_bswap16(x)
+# define HTOLE_16(x) __builtin_bswap16(x)
+# define LETOH_32(x) __builtin_bswap32(x)
+# define HTOLE_32(x) __builtin_bswap32(x)
+#else
+# define LETOH_16(x) (x)
+# define HTOLE_16(x) (x)
+# define LETOH_32(x) (x)
+# define HTOLE_32(x) (x)
+#endif /* gcc or clang */
+
#elif defined(__sun)
#include <sys/byteorder.h>
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