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Each of these options may be passed multiple times. The advantage over the previous interface (environment variables SG_CMAKEARGS and FG_CMAKEARGS) is that the new interface allows one to pass arguments containing spaces to CMake, for instance: --sg-cmake-args='-DCMAKE_CXX_FLAGS=-Wno-deprecated-declarations -Wall' (the single quotes here would be interpreted by the user's shell, and removed before download_and_compile.sh can see them). Setting the environment variables SG_CMAKEARGS and FG_CMAKEARGS should still work as before but is now deprecated. The implementation uses Bash arrays named SG_CMAKE_ARGS and FG_CMAKE_ARGS, but in order to avoid confusing users about the deprecated variable names, the log file continues to print 'SG_CMAKEARGS=...' and 'FG_CMAKEARGS=...' (note the different use of underscores in the names).