qsampler debian package depends on liblscp2, but liblscp debian package builds up with the name "liblscp". That is an inconsistency. Either change one or another.
I just commited a fix. Those dependencies to "liblscp" and "libgig" were hard coded in addition to the dependencies that are automatically completed / filled in by the debhelper scripts. So I removed them, should be fine now. Thanks for the hint!