MurgaLua uses libsqlite the same way it uses libxft. They are both libraries that are accessed at runtime, and not statically linked into the binary. FLTK is a completely different situation. As I understand it FLTK is a set of headers, not a library, so the code needs to be statically bound to Lua in order to use it with Lua. I'm guessing that if FLTK could be used as a dynamic library it would be.