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.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.6/variable/CMAKE_SYSROOT.html