Correct version/release number

Slackware uses the version number as part of the package name. Currently I am using 3.5.11. Yet I notice in various places that possibly 3.5.12 might be correct. Does your svn tree contain a version number I can grab on-the-fly in my build scripts? This would be a typical Slackware package name: kdelibs-3.5.10-i486-3.tgz The -3 is a sequential build number for the respective Slackware release. I could create a package name such as: kdelibs-3.5.10-i486-svn-2010-08-23.tgz or kdelibs-3.5.10-i486-svn_1166993.tgz Is there a place somewhere in the svn tree to grab the correct date/time or svn release number? I appreciate suggestions and help.