Filesystem Hierarchy Standard
This is where all of the system's general-use include files for the C
programming language should be placed.
The following directories, or symbolic links to directories, must be in /usr/include, if the corresponding
subsystem is installed:
BSD compatibility include files (optional)
The symbolic link /usr/include/X11 must link to
/usr/X11R6/include/X11 if the latter exists.
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Translated by troff2html v1.5 on 29 March 2002 by Daniel Quinlan