Upstream developers have finally announced the final version of MATE 1.18
that is pure GTK+3 only. No more mix build of GTK+2/3.
All the SlackBuilds source code has been pushed to github
has been updated with MATE 1.18 screenshots, and binary packages have been uploaded to Slackware.uk for both Stable
(x86_64 only) release. It will be included in the next Slackware Live ISO by AlienBOB as well.
Enjoy MATE 1.18!!!