Make sure we don't use PyQt4 from conda-forge
Make sure we don't use PyQt4 from conda-forge

PennyQ/glue-3d-viewer,astrofrog/glue-vispy-viewers,astrofrog/glue-3d-viewer,PennyQ/astro-vispy,glue-viz/glue-3d-viewer,glue-viz/glue-vispy-viewers