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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 :variable:`CMAKE_TOOLCHAIN_FILE` variable.
See also the :variable:`CMAKE_SYSROOT_COMPILE` and
:variable:`CMAKE_SYSROOT_LINK` variables.