select "open project" (or something like that, haven't used qt creator since last year) and as project file point it to "qtl.pro" file extracted from tar.gz file with sources ( http://sourceforge.net/projects/qlc/files/Sources/ preferably 3.2.2 version). If you prefer madde (I haven't really used that, but that's my guess), "cd" to directory with qtl.pro file and type "qmake qtl.pro" or "qmake qtl" (haven't compiled any qt project lately, forgot if you need to add ".pro").
You may try installing sdk in linux, the above command will work there. There may be some errors during compilation if it cannot find required libraries... You may try to compile it first on desktop linux (e.g. ubuntu) to get familiar with the process. Are you familiar at all with compiling c++?