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function(prevent_in_source_build)
get_filename_component(REAL_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}" REALPATH)
get_filename_component(REAL_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}" REALPATH)
if (REAL_BINARY_DIR STREQUAL REAL_SOURCE_DIR)
message(" Out-of-source build must be used. Remove the files already")
message(" created by CMake and rerun CMake from a new directory:")
message(" rm -rf CMakeFiles CMakeCache.txt")
message(" mkdir build")
message(" cd build")
message(" cmake ..")
message(FATAL_ERROR "In-source build failed.")
endif()
endfunction()
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