as.info: I

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`.include' search path: `-I' PATH

   Use this option to add a PATH to the list of directories `as'
searches for files specified in `.include' directives (*note
`.include': Include.).  You may use `-I' as many times as necessary to
include a variety of paths.  The current working directory is always
searched first; after that, `as' searches any `-I' directories in the
same order as they were specified (left to right) on the command line.