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