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:ref:`Semicolon-separated list <CMake Language Lists>` of directories to be *ignored* by
the :command:`find_program`, :command:`find_library`, :command:`find_file`,
and :command:`find_path` commands. This is useful in cross-compiling
environments where some system directories contain incompatible but
possibly linkable libraries. For example, on cross-compiled cluster
environments, this allows a user to ignore directories containing
libraries meant for the front-end machine.
By default this contains a list of directories containing incompatible
binaries for the host system. See the :variable:`CMAKE_IGNORE_PATH` variable
that is intended to be set by the project.
See also the :variable:`CMAKE_SYSTEM_PREFIX_PATH`,
and :variable:`CMAKE_SYSTEM_PROGRAM_PATH` variables.