Anyway onto the next question, how do I get Qt Creator to merge the library files i have created INTO the .deb file? Currently it doesn't even copy them to the shadow build directory (and thus fails when it tries to find the library - I have to copy then manually). Part two of this question - if the project compiles successfully (with the libraries) then does that mean the library files are ok (i.e. of the same architecure?) or will I find out when I try to create a new object that uses that library?