If cgreen is added as a sub project of any other project, then the cgreen build fails because it's not settings its project directories in relation to a parent project. CGreen should be using PROJECT_SOURCE_DIR instead of CMAKE_SOURCE_DIR for any relative paths
Index: src/CMakeLists.txt
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--- src/CMakeLists.txt (revision 317)
2009-09-21 15:21:22 UTC in Cgreen