Please have a look at CMakeLists.txt for more information regarding
customizable CMake options provided by CMakeLists.txt.

To see all options, one can use this command:
    grep 'option(' CMakeLists.txt

An example CMake command that defines values for such customizable
options is shown here:
    dir=.

    # Clear files generated by CMake to clear the CMake cache.
    ./clean_cmake.sh

    cmake -G "Unix Makefiles" \
        -D "CMAKE_BUILD_TYPE=Debug" \
        -D "CUSTOMIZABLE_OPTION_FOO=hello" \
        -D "CUSTOMIZABLE_OPTION_BAR=world" \
        "$dir"
