if(PKG_KIM)
  set(KIM-API_MIN_VERSION 2.1)
  find_package(CURL)
  if(CURL_FOUND)
    target_link_libraries(lammps PRIVATE CURL::libcurl) 
    target_compile_definitions(lammps PRIVATE -DLMP_KIM_CURL)
    set(LMP_DEBUG_CURL OFF CACHE STRING "Set libcurl verbose mode on/off. If on, it displays a lot of verbose information about its operations.")
    mark_as_advanced(LMP_DEBUG_CURL)
    if(LMP_DEBUG_CURL)
      target_compile_definitions(lammps PRIVATE -DLMP_DEBUG_CURL)
    endif()
    set(LMP_NO_SSL_CHECK OFF CACHE STRING "Tell libcurl to not verify the peer. If on, the connection succeeds regardless of the names in the certificate. Insecure - Use with caution!")
    mark_as_advanced(LMP_NO_SSL_CHECK)
    if(LMP_NO_SSL_CHECK)
      target_compile_definitions(lammps PRIVATE -DLMP_NO_SSL_CHECK)
    endif()
  endif()
  find_package(PkgConfig QUIET)
  find_package(MPI REQUIRED)
  set(DOWNLOAD_KIM_DEFAULT ON)
  if(PKG_CONFIG_FOUND)
    pkg_check_modules(KIM-API QUIET libkim-api>=2.1.3)
    if(KIM-API_FOUND)
      set(DOWNLOAD_KIM_DEFAULT OFF)
    endif()
  endif()
  option(DOWNLOAD_KIM "Download KIM-API from OpenKIM instead of using an already installed one" ${DOWNLOAD_KIM_DEFAULT})
  if(DOWNLOAD_KIM)
    message(STATUS "KIM-API download requested - we will build our own")
    include(ExternalProject)
    enable_language(C)
    enable_language(Fortran)
    ExternalProject_Add(kim_build
      URL https://s3.openkim.org/kim-api/kim-api-2.1.3.txz
      URL_MD5 6ee829a1bbba5f8b9874c88c4c4ebff8
      BINARY_DIR build
      CMAKE_ARGS ${CMAKE_REQUEST_PIC}
                 -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
                 -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
                 -DCMAKE_Fortran_COMPILER=${CMAKE_Fortran_COMPILER}
		 -DCMAKE_INSTALL_LIBDIR=lib
                 -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
                 -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
                 -DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}
                 -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE}
                 BUILD_BYPRODUCTS <INSTALL_DIR>/lib/libkim-api${CMAKE_SHARED_LIBRARY_SUFFIX}
      )
    ExternalProject_get_property(kim_build INSTALL_DIR)
    file(MAKE_DIRECTORY ${INSTALL_DIR}/include/kim-api)
    add_library(LAMMPS::KIM UNKNOWN IMPORTED)
    set_target_properties(LAMMPS::KIM PROPERTIES
      IMPORTED_LOCATION "${INSTALL_DIR}/lib/libkim-api${CMAKE_SHARED_LIBRARY_SUFFIX}"
      INTERFACE_INCLUDE_DIRECTORIES "${INSTALL_DIR}/include/kim-api")
    target_link_libraries(lammps PRIVATE LAMMPS::KIM)
    add_dependencies(LAMMPS::KIM kim_build)
  else()
    find_package(PkgConfig REQUIRED)
    pkg_check_modules(KIM-API REQUIRED IMPORTED_TARGET libkim-api>=2.1.3)
    target_link_libraries(lammps PRIVATE PkgConfig::KIM-API)
  endif()
endif()