Thanks for the insights. I agree having an installed fltk will likely be better if one’s using fltk regularly for different applications.

Normally FetchContent_MakeAvailable would also call add_subdirectory(${fltk_SOURCE_DIR} ${fltk_BUNARY_DIR}) according to the cmake docs. And it does work correctly except for the VS generator.

I actually haven’t tried FetchContent with a local file:/// url. it could work so it’s worth investigating, that would be cool. However a fetched module is for a single CMakeLists BINARY_DIR, so to reuse it one can use multiple add_executable calls, or would have to separate into different projects.

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