Hi Andreas, It appears I have got SeqAn to build. Looks as though they changed the name of one of their seqan-specific cmake options. I fixed d/rules and the build appears to succeed. However the only machine I currently have access to that has sufficient RAM & disk space is running Ubuntu 14.04, and therefore the lintian is way out of date. So I can't comment as to the correctness and cleanliness of the package, but I've pushed my change.
Hope that helps, Cheers, K --- Kevin Murray 0xA4B4EE6A