if(PKG_USER-MOLFILE)
  set(MOLFILE_INCLUDE_DIRS "${LAMMPS_LIB_SOURCE_DIR}/molfile" CACHE STRING "Path to VMD molfile plugin headers")
  add_library(molfile INTERFACE)
  target_include_directories(molfile INTERFACE ${MOLFILE_INCLUDE_DIRS})
  # no need to link with -ldl on windows
  if(NOT ${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
    target_link_libraries(molfile INTERFACE ${CMAKE_DL_LIBS})
  endif()
  list(APPEND LAMMPS_LINK_LIBS molfile)
endif()