sbopkg uses the build scripts at slackbuilds.org to build and install packages. A search at slackbuilds.org does not reveal that it has ever been supported. I also can not find this package in the appropriate e/ section of official slackware packages. Perhaps they just assumed somebody had made build scripts for it.
If you have the time and the know how, you could contribute to the community by submitting a build script to slackbuilds.org
Just double check, Just because I couldn't find it doesn't mean you wont.