projectm-eval provides CMake targets:

  find_package(projectM-Eval REQUIRED)
  target_link_libraries(main PRIVATE projectM::Eval)

To use the ns-eel2 shim with the Milkdrop codebase:

  find_package(projectM-Eval REQUIRED COMPONENTS Milkdrop)
  target_link_libraries(main PRIVATE projectM::ns-eel2)