#-----------------------------------------------------------------------------
# Building in the source tree is forbidden ! 
IF(PROJECT_BINARY_DIR STREQUAL ${PROJECT_SOURCE_DIR})
  MESSAGE(FATAL_ERROR "Building in the source tree is not allowed !! Quit; remove the file 'CMakeCache.txt' and the folder 'CMakeFiles' and build outside the sources")
ENDIF(PROJECT_BINARY_DIR STREQUAL ${PROJECT_SOURCE_DIR})
#-----------------------------------------------------------------------------