Passing Compilation Flag from CMake file

Hi, I'm in the middle of porting OpenMPI. I got some trouble that I have to use CMakelists.txt to pass the Compilation Flag through Makefile. I got this error message while trying to compile: error: 'OMPI_MPIHANDLES_DLL_PREFIX' undeclared (first use in this function) error: 'OMPI_MSGQ_DLL_PREFIX' undeclared (first use in this function) And I found the OMPI_MPIHANDLES_DLL_PREFIX in CMakelist.txt as shown below: SET_TARGET_PROPERTIES(libmpi PROPERTIES COMPILE_FLAGS "${OMPI_C_DEF_PRE}OMPI_ MPIHANDLES_DLL_PREFIX=libompi_dbg_mpihandles ${OMPI_C_DEF_PRE}OMPI_MSGQ_DLL_PREFIX=libompi_dbg_msgq") Does anybody know how to use this CMake file? Regards, Irvanda