Scott Wittenburg d2c3441527 Update gl/qt options for vtk package (#6551) ... This provides options for hardware and software rendering with the gl API and updates the vtk package to make use of those options: * Create new "gl" virtual package, provided by mesa * Add external-only "opengl" package, which represents a system install that provides gl * For vtk: prefer system gl implementation by default to get speed up from hardware rendering. When software rendering is specifically requested (+osmesa), try to use the llvmpipe approach, as it is much faster. * Make qt dependency optional for vtk * Add basic support for VTK on osx * qt: Depend on virtual gl package, rather than mesa impl		2018-01-22 10:46:44 -08:00
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spack/defaults	Update gl/qt options for vtk package (#6551)	2018-01-22 10:46:44 -08:00