vtk_module_third_party(
  INTERNAL
    HEADER_ONLY
    LICENSE_FILES "vtkexprtk/License.txt"
    VERSION       "2.71"
  EXTERNAL
    PACKAGE ExprTk
    VERSION 2.7
    TARGETS ExprTk::ExprTk
    STANDARD_INCLUDE_DIRS)

configure_file(
  "${CMAKE_CURRENT_SOURCE_DIR}/vtk_exprtk.h.in"
  "${CMAKE_CURRENT_BINARY_DIR}/vtk_exprtk.h")

vtk_module_install_headers(
  FILES "${CMAKE_CURRENT_BINARY_DIR}/vtk_exprtk.h")