Semicolon-separated list of directories to be ignored by the various find...() commands.

For find_program(), find_library(), find_file(), and find_path(), any file found in one of the listed directories will be ignored. The listed directories do not apply recursively, so any subdirectories to be ignored must also be explicitly listed. |CMAKE_IGNORE_VAR| does not affect the search prefixes used by these four commands. To ignore individual paths under a search prefix (e.g. bin, include, lib, etc.), each path must be listed in |CMAKE_IGNORE_VAR| as a full absolute path. |CMAKE_IGNORE_PREFIX_VAR| provides a more appropriate way to ignore a whole search prefix.

find_package() is also affected by |CMAKE_IGNORE_VAR|, but only for Config mode searches. Any <Name>Config.cmake or <name>-config.cmake file found in one of the specified directories will be ignored. In addition, any search prefix found in |CMAKE_IGNORE_VAR| will be skipped for backward compatibility reasons, but new code should prefer to use |CMAKE_IGNORE_PREFIX_VAR| to ignore prefixes instead.