I am a NixOS maintainer working on packaging projectM updatating it from pretty old version to today.

Current master, build d1314d0, doind it with configure flags: --enable-qt, --enable-sdl.

Resulting are binaries projectMSDL and projectM-unittest that are referencing in the run-time search path the:

patchelf --print-rpath projectMSDL | tr ':' '\n'
...
/build/source/src/libprojectM/.libs