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(m4.info)Search Path


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Searching for include files
===========================

   GNU `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 (Note: Debug Levels) can help isolate the problem.


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