message(FATAL_ERROR"Required submodules could not be found! First run 'git submodule init' and 'git submodule update' from the root DFHack directory. (See the section 'Getting the Code' in Compile.html)")
message(FATAL_ERROR"One or more required submodules could not be found! Run 'git submodule update --init' from the root DFHack directory. (See the section 'Getting the Code' in Compile.rst or Compile.html)")