# Unpack Boost
add_custom_command(
    OUTPUT ${CUSTOM_BOOST_LOCATION}/boost.unpacked
    COMMAND ${CMAKE_COMMAND} -E tar xzf ${BOOST_ARCHIVE_LOCATION}/${BOOST_ARCHIVE}
    COMMAND touch boost.unpacked
    DEPENDS ${BOOST_ARCHIVE_LOCATION}/${BOOST_ARCHIVE}
    WORKING_DIRECTORY ${CUSTOM_BOOST_LOCATION}
    COMMENT "Unpacking Boost")