Sure. The (L)GPL requires "derivative works" to be licensed under the same terms as the original. The LGPL contains an exemption for works which reference the

Sure. The (L)GPL requires "derivative works" to be licensed under the same terms as the original. The LGPL contains an exemption for works which reference the original as a dynamic library (.dll, .so, .dylib, etc.), such that (unlike with the GPL) non-LGPL software can use LGPL libraries. In other words: if your program only dynamically links against Qt, then it is not a "derivative work" and therefore doesn't have to be licensed under Qt's own license terms.