[kej]

Your application is "infected" if you use Qt without a commercial license, regardless of how you link it. It's a little harder (but still possible) to comply with the LGPL requirements when you statically link, but you are bound to those requirements either way.

[groovebits]

Pretty sure having it dynamically linked is ok with the open source licence

[kej]

Right, my point is that static linking is also okay with the LGPL, albeit slightly more difficult in terms of what you have to make available to end users.

[therockhead]

I believe the parent post is correct and mechanism used to link effects the licence.