OpenBSD compatibility

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/include/platform.h b/include/platform.h
index 0dadf42..1cc5886 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -161,7 +161,7 @@
 # define bswap_32 __bswap32
 # define bswap_16 __bswap16
 # define __BIG_ENDIAN__ (_BYTE_ORDER == _BIG_ENDIAN)
-#elif !defined __APPLE__
+#elif !defined __APPLE__ && !defined __OpenBSD__
 # include <byteswap.h>
 # include <endian.h>
 #endif
@@ -172,9 +172,15 @@
 #elif defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN
 # define BB_BIG_ENDIAN 1
 # define BB_LITTLE_ENDIAN 0
+#elif defined(_BYTE_ORDER) && _BYTE_ORDER == _BIG_ENDIAN
+# define BB_BIG_ENDIAN 1
+# define BB_LITTLE_ENDIAN 0
 #elif (defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN) || defined(__386__)
 # define BB_BIG_ENDIAN 0
 # define BB_LITTLE_ENDIAN 1
+#elif defined(_BYTE_ORDER) && _BYTE_ORDER == _LITTLE_ENDIAN
+# define BB_BIG_ENDIAN 0
+# define BB_LITTLE_ENDIAN 1
 #else
 # error "Can't determine endianness"
 #endif
@@ -230,7 +236,7 @@
 /* ---- Compiler dependent settings ------------------------- */
 
 #if (defined __digital__ && defined __unix__) \
- || defined __APPLE__ || defined __FreeBSD__
+ || defined __APPLE__ || defined __FreeBSD__ || defined __OpenBSD__
 # undef HAVE_MNTENT_H
 # undef HAVE_SYS_STATFS_H
 #else