CMake Error at BadSources1.cmake:1 \(try_compile\):
  Unknown extension ".c" for file

    .*/Tests/RunCMake/try_compile/src.c

  try_compile\(\) works only for enabled languages.  Currently these are:

    NONE

  See project\(\) command to enable other languages.
Call Stack \(most recent call first\):
  CMakeLists.txt:3 \(include\)