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8.2 Searching for include files
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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 ( Invoking m4).
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 ( Debug Levels) can help isolate the problem.
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