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

    \$<COMPILE_LANGUAGE>

  \$<COMPILE_LANGUAGE:\.\.\.> may only be used to specify include directories,
  compile definitions, compile options, and to evaluate components of the
  file\(GENERATE\) command\.
Call Stack \(most recent call first\):
  CMakeLists\.txt:3 \(include\)
