[vtk-developers] OSMesa regression

[Bill Lorensen]

Folks,

git bisect identified this commit
# first bad commit: [f09903e468b60c20a1e30cb665a5a72a8ab3140f] COMP:
Add logic to selectively use OpenGL or OSMesa.
https://gitlab.kitware.com/vtk/vtk/merge_requests/427

causes these errors in my OSMesa build:
Linking CXX shared library ../../lib/libvtkGUISupportQt-6.3.so
CMakeFiles/vtkGUISupportQt.dir/QVTKWidget.cxx.o: In function
`QVTKWidget::x11_setup_window()':
/home/lorensen/ProjectsGIT/VTKGerrit/GUISupport/Qt/QVTKWidget.cxx:736:
undefined reference to `XGetWindowAttributes'
/home/lorensen/ProjectsGIT/VTKGerrit/GUISupport/Qt/QVTKWidget.cxx:740:
undefined reference to `XCreateWindow'
/home/lorensen/ProjectsGIT/VTKGerrit/GUISupport/Qt/QVTKWidget.cxx:746:
undefined reference to `XGetWMColormapWindows'
/home/lorensen/ProjectsGIT/VTKGerrit/GUISupport/Qt/QVTKWidget.cxx:750:
undefined reference to `XFree'
/home/lorensen/ProjectsGIT/VTKGerrit/GUISupport/Qt/QVTKWidget.cxx:777:
undefined reference to `XSetWMColormapWindows'
/home/lorensen/ProjectsGIT/VTKGerrit/GUISupport/Qt/QVTKWidget.cxx:780:
undefined reference to `XFree'
/home/lorensen/ProjectsGIT/VTKGerrit/GUISupport/Qt/QVTKWidget.cxx:782:
undefined reference to `XFlush'
collect2: error: ld returned 1 exit status
make[3]: *** [lib/libvtkGUISupportQt-6.3.so.1] Error 1
make[2]: *** [GUISupport/Qt/CMakeFiles/vtkGUISupportQt.dir/all] Error 2
make[1]: *** [GUISupport/Qt/CMakeFiles/vtkGUISupportQt.dir/rule] Error 2
make: *** [vtkGUISupportQt] Error 2