CMAKE_SYSROOT

From Get docs
Cmake/docs/3.21/variable/cmake sysroot


CMAKE_SYSROOT

Path to pass to the compiler in the --sysroot flag.

The CMAKE_SYSROOT content is passed to the compiler in the --sysroot flag, if supported. The path is also stripped from the RPATH/RUNPATH if necessary on installation. The CMAKE_SYSROOT is also used to prefix paths searched by the find_* commands.

This variable may only be set in a toolchain file specified by the CMAKE_TOOLCHAIN_FILE variable.

See also the CMAKE_SYSROOT_COMPILE and CMAKE_SYSROOT_LINK variables.

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https://cmake.org/cmake/help/v3.21/variable/CMAKE_SYSROOT.html