^CMake Error at .*/Modules/ExternalProject.cmake:[0-9]+ \(message\):
  No download info given for 'MyProj' and its source directory:

   .*/Tests/RunCMake/ExternalProject/SourceMissing-build/SourceMissing

  is not an existing non-empty directory.  Please specify one of:

   \* SOURCE_DIR with an existing non-empty directory
   \* URL
   \* GIT_REPOSITORY
   \* HG_REPOSITORY
   \* CVS_REPOSITORY and CVS_MODULE
   \* SVN_REVISION
   \* DOWNLOAD_COMMAND
Call Stack \(most recent call first\):
  .*/Modules/ExternalProject.cmake:[0-9]+ \(_ep_add_download_command\)
  SourceMissing.cmake:[0-9]+ \(ExternalProject_Add\)
  CMakeLists.txt:[0-9]+ \(include\)$