Description of problem: It looks like /usr/lib64/pkgconfig/mozilla-nspr.pc from mozilla-nspr-devel-1.7-0.3.2 has a -L/usr/lib in it, which seems wrong... Version-Release number of selected component (if applicable): mozilla-nspr-devel-1.7-0.3.2
This was fixed a while ago, in 1.7.6-3