if(PKG_CORESHELL)
    set(CORESHELL_SOURCES_DIR ${LAMMPS_SOURCE_DIR}/CORESHELL)
    set(CORESHELL_SOURCES)
    set_property(GLOBAL PROPERTY "CORESHELL_SOURCES" "${CORESHELL_SOURCES}")

    # detects styles which have a CORESHELL version
    RegisterStylesExt(${CORESHELL_SOURCES_DIR} cs CORESHELL_SOURCES)

    get_property(CORESHELL_SOURCES GLOBAL PROPERTY CORESHELL_SOURCES)

    list(APPEND LIB_SOURCES ${CORESHELL_SOURCES})
    include_directories(${CORESHELL_SOURCES_DIR})
endif()