Note that with the modular X.org, some component versions do not
change version, but need to be recompiled against the rest of
X11.

To facilitate this, Slackware as a 'build' directory containing text files
of the filenames of packages.  Each text file contains the build number.

ARMedslack uses a dir named 'build-nums' for the same thing. We don't
just use Slackware's build numbers since we may need to keep our own.
(I prefered the 'build-nums' name since it was more obvious what the dir was for).

However, for major X.org upgrades, we will want to copy all of Slackware's
build numbers.  Mostly anyway -- obviously there are some times where ARMedslack
may have a higher build number than Slackware already, so there's going to be
some manual checks in here.

http://216.239.59.104/search?q=cache:CCfeSMZ0udsJ:www.robert-bruce.co.uk/package.keywords+x11+util-macros+app&hl=en&ct=clnk&cd=3&gl=uk