To generate the Slackware afpfs package for XBMC use:
(We assume the xbmc source is unpacked under /opt)
1. Copy the afpfs-ng.SlacBuild file in /opt/xbmc-xx.x/lib/afpfs-ng/
2. Copy slack-desc int /opt/xbmc-xx.x/lib/afpfs-ng/
3. cd into /opt/xbmc-xx.x/lib/afpfs-ng/
4. run ./afpfs-ng.SlacBuild

The Slackware package will be generated in /tmp