-source_dl = http://downloads.sourceforge.net/project/libpng/libpng15/%{version}/
-sources = %{thisapp}.tar.xz
+source_dl = http://downloads.sourceforge.net/project/libpng/libpng16/%{version}/
+source_dl += http://downloads.sourceforge.net/project/libpng/history/libpng16/%{version}/