From "Slackware Linux Essentials":
http://www.slackbook.org/html/packag...-tagfiles.html
Option Meaning
ADD The package is required for proper system operation
SKP The package will be automatically skipped
REC The package is not required, but recommended
OPT The package is optional
From the X packages tagfile:
http://slackware.cs.utah.edu/slackwa...ware/x/tagfile
x11: ADD
x11-devel: ADD
x11-docs: REC
x11-docs-html: OPT
x11-fonts-100dpi: OPT
x11-fonts-cyrillic: OPT
x11-fonts-misc: ADD
x11-fonts-scale: ADD
x11-xdmx: OPT
x11-xnest: OPT
x11-xvfb: OPT
The ones with "ADD" are required.