I also modified the CMake and pkgconfig files to append the _POSTFIX extenstion based on the CMAKE_BUILD_TYPE.
Additionally I fixed packaging/ld.so.conf.d/openscenegraph.conf.in to add a '/' betweeen the arguments since the CMAKE_INSTALL_PREFIX can't end with a '/'.
"
openscenegraph.pc and openthreads.pc files with OSG's installation values.
Then I install those files into the expected path for pkg-config (this can
also be modified through PKG_CONFIG_PATH environment variable). Therefore
those of us who are using pkg-config for linking can easily select which
version of OSG we want to use."