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Ultimately autotools isn't doing anything magical, so it's not unusual for cross-platform package managers like vcpkg to simply ignore all that and write their own clean CMakeLists.txt.

In this particular case xz-utils actually did support CMake for building liblzma, so that's what you use if you don't care about the command line tools.

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I never thought it was magical.

It's also worth appreciating that in the case of the xz project, the CMake flow is secondary other than for Windows. While I have no evidence one way or another, I wonder if the period in the CMake test that disabled Linux Landlock was actually intentional. Since it disabled it for the CMake build and not the autotools build, it seems like it could have been accidental, unless some significant liblzma consumer builds with CMake and would have otherwise had Landlock enabled.

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