If you have the perl source rpm you can just extract the spec file (according to this forum post, although I've not tried it myself):

You can extract the spec file from a source rpm file (some times a bin
+ary rpm file), using command:

rpm2cpio {FullNameOfRPM} | cpio -iumd {NameOfRPM.spec}
[download]

Isn't Fedora open source? Can't you just find where their repository is and do a checkout?