Bug#1000501: vtk9 FTBFS: Could not find the Qt5 external dependency.

[Adrian Bunk]

Source: vtk9
Version: 9.1.0+dfsg1-1
Severity: serious
Tags: ftbfs

https://buildd.debian.org/status/logs.php?pkg=vtk9&ver=9.1.0%2Bdfsg1-1

...
CMake Error at CMake/vtkModule.cmake:4403 (message):
  Could not find the Qt5 external dependency.
Call Stack (most recent call first):
  GUISupport/Qt/CMakeLists.txt:43 (vtk_module_find_package)


-- Configuring incomplete, errors occurred!