list(TRANSFORM ...) is not portable to older versions of cmake. work around it.

    add_dependencies(lammps ${LAMMPS_DEPS})

  endif()

  set(LAMMPS_CXX_HEADERS

    angle.h

    atom.h

    bond.h

    citeme.h

    comm.h

    compute.h

    dihedral.h

    domain.h

    error.h

    fix.h

    force.h

    group.h

    improper.h

    input.h

    kspace.h

    lammps.h

    lattice.h

    lmppython.h

    memory.h

    modify.h

    neighbor.h

    neigh_list.h

    output.h

    pair.h

    pointers.h

    region.h

    timer.h

    universe.h

    update.h

    variable.h)

  list(TRANSFORM LAMMPS_CXX_HEADERS PREPEND ${LAMMPS_SOURCE_DIR}/)

    ${LAMMPS_SOURCE_DIR}/angle.h

    ${LAMMPS_SOURCE_DIR}/atom.h

    ${LAMMPS_SOURCE_DIR}/bond.h

    ${LAMMPS_SOURCE_DIR}/citeme.h

    ${LAMMPS_SOURCE_DIR}/comm.h

    ${LAMMPS_SOURCE_DIR}/compute.h

    ${LAMMPS_SOURCE_DIR}/dihedral.h

    ${LAMMPS_SOURCE_DIR}/domain.h

    ${LAMMPS_SOURCE_DIR}/error.h

    ${LAMMPS_SOURCE_DIR}/fix.h

    ${LAMMPS_SOURCE_DIR}/force.h

    ${LAMMPS_SOURCE_DIR}/group.h

    ${LAMMPS_SOURCE_DIR}/improper.h

    ${LAMMPS_SOURCE_DIR}/input.h

    ${LAMMPS_SOURCE_DIR}/kspace.h

    ${LAMMPS_SOURCE_DIR}/lammps.h

    ${LAMMPS_SOURCE_DIR}/lattice.h

    ${LAMMPS_SOURCE_DIR}/lmppython.h

    ${LAMMPS_SOURCE_DIR}/memory.h

    ${LAMMPS_SOURCE_DIR}/modify.h

    ${LAMMPS_SOURCE_DIR}/neighbor.h

    ${LAMMPS_SOURCE_DIR}/neigh_list.h

    ${LAMMPS_SOURCE_DIR}/output.h

    ${LAMMPS_SOURCE_DIR}/pair.h

    ${LAMMPS_SOURCE_DIR}/pointers.h

    ${LAMMPS_SOURCE_DIR}/region.h

    ${LAMMPS_SOURCE_DIR}/timer.h

    ${LAMMPS_SOURCE_DIR}/universe.h

    ${LAMMPS_SOURCE_DIR}/update.h

    ${LAMMPS_SOURCE_DIR}/variable.h)

  set_target_properties(lammps PROPERTIES OUTPUT_NAME lammps${LAMMPS_LIB_SUFFIX})

  set_target_properties(lammps PROPERTIES SOVERSION ${SOVERSION})