Issue with .pc files, Libs rendering incorrectly

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I am using osc / OpenSUSE OBS to build RPM packages of catkin for OpenSUSE. In my .spec file, I am doing something like this (for example, with the message_generation package):

%setup -q -c -n workspace
mv * message_generation
mkdir src
mv message_generation src

%build
CMAKE_PREFIX_PATH=/usr catkin_make_isolated --install

The issue I am currently having is that the way the code is written for catkin, my message_generation.pc file in the workspace/install_isolated directory looks like this:

Description: Description of message_generation
Version: 0.2.10
Cflags: 
Libs: -L/home/abuild/rpmbuild/BUILD/workspace/install_isolated/lib 
Requires: gencpp genlisp genmsg genpy

I would like Libs to be -L/usr/lib, where I am planning on moving the lib directory, but instead, I am seeing that build environment path, which shouldn't happen. How can I go about doing this?