set_package_properties(OsmTools PROPERTIES TYPE OPTIONAL PURPOSE "Needed only for regenereating line metadata tables (you don't need this for distribution)")
find_package(PolyClipping)
set_package_properties(PolyClipping PROPERTIES TYPE OPTIONAL PURPOSE "Needed only for processing coverage area data from the Transport API Repository (you don't need this for distribution)")
if(NOT CMAKE_CROSSCOMPILING)
find_package(PolyClipping)
set_package_properties(PolyClipping PROPERTIES TYPE OPTIONAL PURPOSE "Needed only for processing coverage area data from the Transport API Repository (you don't need this for distribution)")