The dependency was added due to the QtTreeView not updating on certain changes in the annotations, so the logic was triggering it. Also the CMakeLists.txt was probably mostly copied and not pared down initially.

Seems that only the following is Qt dependent:
QString tempPath =
qSlicerCoreApplication::application()->temporaryPath();
tempPath.append(annotationNode->GetID());
tempPath.append(".png");

  QByteArray tempPathArray = tempPath.toLatin1();

This is in the HTML report functionality, so not core. I can have it just use the present directory instead unless there's a pure VTK way to get at the temporary path set in the Qt core application.

You can maybe expose Get/SetTemporaryDirectory() methods that are set in teh setup() of the annotation module.

But as stated by 0002416, such temp path should be available by MRML anyway.

Pushed code here (in the same branch of its parent topic)
https://github.com/yuzhengZ/Slicer/commit/25aad83ff50f6ade27c09221b85236c822539b9e

Fixed in r22230
See http://viewvc.slicer.org/viewvc.cgi/Slicer4?view=revision&revision=22230

Closing resolved issues that have not been updated in more than 3 months

Fix committed to 2145-support-for-installing-extension-from-file branch.