In SPEC l. 54 probably lib/ should be included as well, otherwise it is not possible to install.
Fixed in: http://koji.fedoraproject.org/koji/taskinfo?taskID=6851990
piglit-1-0.15.20140414GIT8775223.el6 has been submitted as an update for Fedora EPEL 6. https://admin.fedoraproject.org/updates/piglit-1-0.15.20140414GIT8775223.el6
piglit-1-0.15.20140414GIT8775223.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/piglit-1-0.15.20140414GIT8775223.fc20
Package piglit-1-0.15.20140414GIT8775223.el6: * should fix your issue, * was pushed to the Fedora EPEL 6 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=epel-testing piglit-1-0.15.20140414GIT8775223.el6' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-EPEL-2014-1424/piglit-1-0.15.20140414GIT8775223.el6 then log in and leave karma (feedback).
piglit-1-0.16.20140414GIT8775223.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/piglit-1-0.16.20140414GIT8775223.fc20
piglit-1-0.15.20140414GIT8775223.el6 has been pushed to the Fedora EPEL 6 stable repository. If problems still persist, please make note of it in this bug report.
piglit-1-0.19.20140414GIT8775223.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/piglit-1-0.19.20140414GIT8775223.fc20
piglit-1-0.19.20140414GIT8775223.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.