Description of problem:
From /usr/lib64/pkgconfig/libqpid-proton.pc -
Note that prefix and exec_prefix are correct but libdir and includedir don't make any sense.
This might be an issue with the upstream package or the rpm packaging process. It looks like there is an extraneous /usr/ in the way that libdir and indlucedir are constructed.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. yum install qpid-proton-c-devel
File extract above should be: