The webkitgtk package will be removed from rawhide after Fedora 26 is branched due to the high number of unfixed security vulnerabilities. You must remove this dependency or your package will not be present in Fedora 27.
Please refer to  for a FAQ on this matter and be advised that for some packages this may require a substantial amount of work.
Note: if ghc-webkit is a bindings package specifically intended to provide WebKit1 or GTK+ 2 bindings, then it can safely be retired.
This bug appears to have been reported against 'rawhide' during the Fedora 26 development cycle.
Changing version to '26'.
$ fedpkg retire "webkitgtk was dropped from f27+ (#1375825)"
/usr/lib/python2.7/site-packages/fedora/client/bodhi.py:48: DeprecationWarning: fedora.client.bodhi has been deprecated. Please use bodhi.client.bindings instead.
Could not execute retire: Un-expected openid provider asked: https://admin.fedoraproject.org/pkgdb/
I ran "fedpkg retire" again without error at least
ghc-rpm-macros-1.6.50-9.fc27 has been submitted as an update to Fedora 27. https://bodhi.fedoraproject.org/updates/FEDORA-2017-e804445201
ghc-rpm-macros-1.6.50-9.fc27 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-e804445201
ghc-rpm-macros-1.6.50-9.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.