* dish.sh: generate SHA-2 hashes


git-svn-id: https://svn.apache.org/repos/asf/serf/trunk@1805461 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/dist.sh b/dist.sh
index 4f153ff..51e7491 100755
--- a/dist.sh
+++ b/dist.sh
@@ -87,9 +87,10 @@
 
 cd ${work}
 
-# allow md5sum and sha1sum tool names to be overridden
+# allow checksum tool names to be overridden
 [ -n "$MD5SUM" ] || MD5SUM=md5sum
 [ -n "$SHA1SUM" ] || SHA1SUM=sha1sum
+[ -n "$SHA256SUM" ] || SHA256SUM=sha1sum
 
 echo ""
 echo "Done:"
@@ -130,3 +131,6 @@
 echo "sha1sums:"
 $SHA1SUM "${release}.tar.bz2" "${release}.zip"
 echo ""
+echo "sha256sums:"
+$SHA256SUM "${release}.tar.bz2" "${release}.zip"
+echo ""