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The CMake variable CMAKE_FIND_ROOT_PATH specifies one or more
directories to be prepended to all other search directories. This
effectively "re-roots" the entire search under given locations.
Paths which are descendants of the :variable:`CMAKE_STAGING_PREFIX` are excluded
from this re-rooting, because that variable is always a path on the host system.
By default the CMAKE_FIND_ROOT_PATH is empty.
The :variable:`CMAKE_SYSROOT` variable can also be used to specify exactly one
directory to use as a prefix. Setting :variable:`CMAKE_SYSROOT` also has other
effects. See the documentation for that variable for more.
These variables are especially useful when cross-compiling to
point to the root directory of the target environment and CMake will
search there too. By default at first the directories listed in
CMAKE_FIND_ROOT_PATH are searched, then the :variable:`CMAKE_SYSROOT` directory is
searched, and then the non-rooted directories will be
searched. The default behavior can be adjusted by setting
|CMAKE_FIND_ROOT_PATH_MODE_XXX|. This behavior can be manually
overridden on a per-call basis. By using CMAKE_FIND_ROOT_PATH_BOTH
the search order will be as described above. If
NO_CMAKE_FIND_ROOT_PATH is used then CMAKE_FIND_ROOT_PATH will not be
used. If ONLY_CMAKE_FIND_ROOT_PATH is used then only the re-rooted
directories and directories below :variable:`CMAKE_STAGING_PREFIX` will be searched.
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