diff -up seamonkey-2.39b1/mozilla/configure.in.libpng-version seamonkey-2.39b1/mozilla/configure.in
--- seamonkey-2.39b1/mozilla/old-configure.in.libpng-version	2015-11-01 16:52:30.999937686 +0100
+++ seamonkey-2.39b1/mozilla/old-configure.in	2015-11-01 17:45:38.488099657 +0100
@@ -47,7 +47,7 @@ _SUBDIR_CONFIG_ARGS="$ac_configure_args"
 dnl Set the version number of the libs included with mozilla
 dnl ========================================================
 MOZJPEG=62
-MOZPNG=10621
+MOZPNG=10513
 NSPR_VERSION=4
 NSPR_MINVER=4.12
 NSS_VERSION=3