Hi,
Regarding to the Linux miner I've just found out that my last day work was a little useless because tandyuk in his repository already merged the relevant changes to a different branch that works also with datacoin. Source is here: https://github.com/tandyuk/jhPrimeminer/tree/mumu-v8
Building instructions can be found also there. (This version doesn't requires the "-getwork" parameter)
There are still problems with solo mining on the Linux builds in general because of some communication problems with the wallet. Each request to the wallet takes at least 2 sec and the connection is not closed correctly as a result the miner doesn't gets the new block notification in time and also may result in crashing the wallet. I'm working on fixing this issue.

-M