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+CMAKE_IGNORE_PATH
+-----------------
+
+Path to be ignored by FIND_XXX() commands.
+
+Specifies directories to be ignored by searches in FIND_XXX()
+commands. This is useful in cross-compiled 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 that modules like FindX11 (and others) would
+normally search. By default this is empty; it is intended to be set
+by the project. Note that CMAKE_IGNORE_PATH takes a list of directory
+names, NOT a list of prefixes. If you want to ignore paths under
+prefixes (bin, include, lib, etc.), you'll need to specify them
+explicitly. See also CMAKE_PREFIX_PATH, CMAKE_LIBRARY_PATH,
+CMAKE_INCLUDE_PATH, CMAKE_PROGRAM_PATH.