The following is a list of notes on building MATE on Slackware -current:

Mon Jun 24 01:38:36 UTC 2013
mate-media is reported to be broken on -current (but not on Slackware 14.0
despite the same version is being used).  The fix for this issue is to use the
precompiled binary packages for Slackware 14.0 which is reported to be working
fine on Slackware -current.

Tue Jun 11 00:41:15 UTC 2013
Pat has rebuilt xdg-utils in Slackware -current to properly support MATE DE,
so xdg-utils patch is no longer needed in Slackware -current, but running
these two commands as normal user are still needed to set caja as the default
handler:

xdg-mime default caja-folder-handler.desktop inode/directory
xdg-mime default caja-folder-handler.desktop application/x-directory

please make a backup of your $HOME/.local/share/applications/defaults.list
before executing the above commands

Tue Mar 26 02:06:35 UTC 2013
Another note about the addition of dconf to Slackware -current.  If you
previously built MATE packages with the dconf in the MATE SlackBuilds /deps
directory, you'll need to rebuild the following packages using the new dconf
in -current:

base/mate-control-center
base/mate-panel
base/mate-settings-daemon
extra/mate-terminal

Sun Mar 24 04:48:35 UTC 2013
Pat just added dconf to Slackware -current and dconf is included as a
dependency package in the /base directory.  So, if you are building MATE on
-current with Pat's new dconf installed, you shouldn't need to build the dconf
package in the MATE SlackBuild repository.  And if you are using the
mate-build-base.sh script, then please edit that script and remove line 52:

dconf \

And then proceed with running the script.  Please report any issues.  Thanks!