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+CMAKE_IGNORE_PREFIX_PATH
+------------------------
+
+:ref:`Semicolon-separated list <CMake Language Lists>` of prefix to be *ignored* by
+the :command:`find_program`, :command:`find_library`, :command:`find_file`,
+:command:`find_path`, and :command:`find_package` 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 is empty; it is intended to be set by the project.
+Note that ``CMAKE_IGNORE_PREFIX_PATH`` takes a list of prefixes, *not*
+a list of directory names.
+
+See also the :variable:`CMAKE_PREFIX_PATH`, :variable:`CMAKE_LIBRARY_PATH`,
+:variable:`CMAKE_INCLUDE_PATH`, and :variable:`CMAKE_PROGRAM_PATH` variables.