Index: galerautils/src/gu_byteswap.h
--- galerautils/src/gu_byteswap.h.orig
+++ galerautils/src/gu_byteswap.h
@@ -57,6 +57,10 @@ static GU_FORCE_INLINE uint64_t GU_ROTL64 (uint64_t x,
 #  define gu_bswap16 BSWAP_16
 #  define gu_bswap32 BSWAP_32
 #  define gu_bswap64 BSWAP_64
+#elif defined(__OpenBSD__)
+#  define gu_bswap16 swap16
+#  define gu_bswap32 swap32
+#  define gu_bswap64 swap64
 #elif defined(bswap16)
 #  define gu_bswap16 bswap16
 #  define gu_bswap32 bswap32