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m4 allows included files to be found in other directories
than the current working directory.
If a file is not found in the current working directory, and the file name is not absolute, the file will be looked for in a specified search path. First, the directories specified with the `-I' option will be searched, in the order found on the command line. Second, if the `M4PATH' environment variable is set, it is expected to contain a colon-separated list of directories, which will be searched in order.
If the automatic search for include-files causes trouble, the `p' debug flag (see section 6.3 Controlling debugging output) can help isolate the problem.
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