message: CMake: Don't hardcode installation folder in RPATH
  This is a bit more fragile than I'd like - setting LIBDIR to a full path
  will not work as expected - but I'm not sure if there's a good way to
  resolve this otherwise, and this seems to work fine by default.
diff: @@ -57,7 +57,8 @@ if(BUILD_TOOLS)
  target_link_libraries(gltfpack meshoptimizer)
  list(APPEND TARGETS gltfpack)
  - set_target_properties(gltfpack PROPERTIES INSTALL_RPATH "$ORIGIN/../lib")
  + string(CONCAT RPATH "$ORIGIN/../" ${CMAKE_INSTALL_LIBDIR})
  + set_target_properties(gltfpack PROPERTIES INSTALL_RPATH ${RPATH})
  endif()
  include(GNUInstallDirs)
  