Comment 1 for bug 651474

Description of problem:
If you want to build a package which is depended on another package, and detects it with pkgconfig it won't get detected if this other package is in a non standard path (which was set in PKG_CONFIG_PATH)
The patch from bug 212522 creates this bug:
https://bugzilla.redhat.com/show_bug.cgi?id=212522

Version-Release number of selected component (if applicable):
4.4.2.3-18

How reproducible:

Steps to Reproduce:
1. install/build something with another prefix path (for example /usr/broken), with a pkgconfig file, like eventlog: http://www.balabit.com/downloads/files/eventlog/0.2/
2. set PKG_CONFIG_PATH to the prefix path from step 1
3. build something with rpmbuild which detects in it's configure where the package from step 1 is located, like syslog-ng: http://www.balabit.com/downloads/files/syslog-ng/

Actual results:
pkgconfig reports the package is not found, this works when building from commandline, or with all rpm(build) packages before 4.4.2.3-18

Expected results:
pkgconfig should find the package.

Additional info:
The PKG_CONFIG_PATH is actually set by another package we build.

Proposed fix:
Modify the patch form the other the bug mentioned above so it does not overwrite the PKG_CONFIG_PATH but extends it.