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(m4.info.gz) File Inclusion

 
 8.2 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 ( 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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