CMake Error at target_sources.cmake:2 \(target_sources\):
  Error evaluating generator expression:

    \$<LINK_LANGUAGE>

  \$<LINK_LANGUAGE:...> may only be used with binary targets to specify link
  libraries, link directories, link options and link depends.
Call Stack \(most recent call first\):
  CMakeLists.txt:3 \(include\)