|Games and educational binaries (optional)|
|Header files included by C programs|
|Binaries run by other programs (optional)|
|Alternate Format Libraries (optional)|
|Source code (optional)|
An exception is made for the X Window System because of considerable precedent and widely-accepted practice.
The following symbolic links to directories may be present. This
possibility is based on the need to preserve compatibility with older
systems until all distribution can be assumed to use the
/usr/spool -> /var/spool /usr/tmp -> /var/tmp /usr/spool/locks -> /var/lock
Once a system no longer requires any one of the above symbolic links, the link may be removed, if desired.