In addition to the official release, the MAME team periodically releases updates to the most recent official release. These are packaged as diff/patch files and should be applied by switching to the base of your MAME source tree (where the makefile lives) and executing:
patch -p0 -E <diffname.diff
where diffname.diff is the name of the .diff file that contains the patch. You can download a set of native Windows diff/patch tools here.
Below is a list of the currently available updates for the latest release:
|MAME 0.148 Updates (Source Code Only)|
|(no updates to MAME 0.148 available at this time)|