Index: bswap.h
===================================================================
--- bswap.h	(revision 5786)
+++ bswap.h	(working copy)
@@ -5,6 +5,12 @@
 
 #include <inttypes.h>
 
+#ifdef HAVE_MACHINE_BSWAP_H
+#include <sys/endian.h>
+#include <sys/types.h>
+#include <machine/bswap.h>
+#else
+
 #ifdef HAVE_BYTESWAP_H
 #include <byteswap.h>
 #else
@@ -58,6 +64,8 @@
     return bswap_64(x);
 }
 
+#endif /* ! HAVE_MACHINE_BSWAP_H */
+
 static inline void bswap16s(uint16_t *s)
 {
     *s = bswap16(*s);
Index: configure
===================================================================
--- configure	(revision 5786)
+++ configure	(working copy)
@@ -1222,6 +1233,15 @@
   if $cc $ARCH_CFLAGS -o $TMPE $TMPC 2> /dev/null ; then
     echo "#define HAVE_BYTESWAP_H 1" >> $config_h
   fi
+  cat > $TMPC << EOF
+#include <sys/endian.h>
+#include <sys/types.h>
+#include <machine/bswap.h>
+int main(void) { return bswap32(0); }
+EOF
+  if $cc $ARCH_CFLAGS -o $TMPE $TMPC 2> /dev/null ; then
+    echo "#define HAVE_MACHINE_BSWAP_H 1" >> $config_h
+  fi
 fi
 
 if [ "$openbsd" = "yes" ] ; then