Description of problem:
Building mate-themes fails in f20 at koji build server.

DEBUG util.py:314:  Executing command: ['/usr/bin/yum-builddep', '--installroot', '/var/lib/mock/f20-build-1715908-301205/root/', '/var/lib/mock/f20-build-1715908-301205/root///builddir/build/SRPMS/mate-themes-1.6.1-2.fc20.src.rpm'] with env {'LANG': 'en_US.UTF-8', 'TERM': 'vt100', 'SHELL': '/bin/bash', 'HOSTNAME': 'mock', 'PROMPT_COMMAND': 'echo -n "<mock-chroot>"', 'HOME': '/builddir', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin'}
DEBUG util.py:264:  Getting requirements for mate-themes-1.6.1-2.fc20.src
DEBUG util.py:264:   --> icon-naming-utils-0.8.90-9.fc19.noarch
DEBUG util.py:264:   --> mate-common-1.6.1-1.fc20.noarch
DEBUG util.py:264:   --> mate-doc-utils-1.6.1-1.fc20.noarch
DEBUG util.py:264:   --> mate-icon-theme-devel-1.6.1-1.fc20.noarch
DEBUG util.py:264:   --> gtk2-devel-2.24.19-1.fc20.x86_64
DEBUG util.py:264:   --> gdk-pixbuf2-devel-2.29.0-1.fc20.x86_64
DEBUG util.py:264:  Error: Package: gdk-pixbuf2-devel-2.29.0-1.fc20.x86_64 (build)
DEBUG util.py:264:             Requires: pkgconfig(libpng15)

http://koji.fedoraproject.org/koji/taskinfo?taskID=5512912
complete root.log
http://kojipkgs.fedoraproject.org//work/tasks/2912/5512912/root.log

Please rebuild against libpng-1.6.2-1.fc20

Thank you

Wolfgang