Disabling CONTOUR_FRONTEND_GUI breaks install target #1780
Description
It looks from CMakeLists that CONTOUR_FRONTEND_GUI can be disabled, and that will still produce something meaningful (with reduced functionality). However, in result only several static libs are built and nothing gets installed: CMake errors out on a missing target for that.
If this is a feature existing for developers only (which by design produces only libs which are not meant to be directly installable), perhaps makes sense to clearly mark that, so that nobody tries to build the app that way.
If building contour without GUI is still meaningful, then the target should be fixed.