Broken Package libvtk6-qt-dev on Ubuntu 21.04
I'm not sure where to post it, since the official package issue page seems to be abandoned.
I did a matrix build between all current Ubuntu versions and all VTK versions available there. There I found a problem with
libvtk6-qt-dev on Ubuntu 21.04: The
VTKTargets-none.cmake reference to
libvtkGUISupportQt-6.3.so.6 .3.0 as
IMPORTED_LOCATION and as
libvtkGUISupportQt-6.3.so.6 .3 - but libvtk6-qt-dev only provides
libvtkRenderingOpenGL-6.3.so (which is a broken link to
libvtk7-qt-dev depends on
libvtk7.1p-qt which contains the required files. The vtk6 counter package
libvtk6.3-qt, on the other hand, is an almost empty package.