diff --git a/build_tools/make_buildopts_h b/build_tools/make_buildopts_h
index b98d875a05..ace4045551 100755
--- a/build_tools/make_buildopts_h
+++ b/build_tools/make_buildopts_h
@@ -26,6 +26,9 @@ case ${OSARCH} in	# actually we should check build_os
 *BSD|mingw|darwin*)
 	BUILDSUM=`echo ${TMP} | md5 | cut -c1-32`
 	;;
+SunOS)
+	BUILDSUM=`echo ${TMP} | digest -a md5 | cut -c1-32`
+	;;
 *)
 	BUILDSUM=`echo ${TMP} | md5sum | cut -c1-32`
 	;;