diff --git a/mapserver.spec b/mapserver.spec
index ad2a802..2620237 100644
--- a/mapserver.spec
+++ b/mapserver.spec
@@ -149,6 +149,7 @@ chmod -x mapscript/php3/README.WIN32
    --with-php=`php-config --include-dir` \
    --with-httpd=/usr/sbin/httpd2 \
    --with-fastcgi=/usr \
+   --with-experimental-png \
    --without-pdf \
    --without-eppl \
    --with-threads \
@@ -286,6 +287,8 @@ rm -rf %{buildroot}
 %{_javadir}/*.jar
 
 %changelog
+* Mon Dec 06 2010 Stephan Holl <stephan.holl@intevation.de> 5.6.5
+- added --with-experimental-png-compile-flag
 * Wed Oct 13 2010 Stephan Holl <stephan.holl@intevation.de> 5.6.5
 - added a patch to hide layers from GetCapabilitites-Output. Use
   Metadataentry 'OWS_HIDDEN_LAYER' 'true' inside your layer