# How to build VTK with vtkParallelTimer
**URL:** https://discourse.vtk.org/t/how-to-build-vtk-with-vtkparalleltimer/2228
**Category:** Development
**Created:** [December 7, 2019, 6:27am UTC](https://discourse.vtk.org/t/how-to-build-vtk-with-vtkparalleltimer/2228 "2019-12-07T06:27:24Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@toddy](https://discourse.vtk.org/u/toddy)
#### Post date: [December 7, 2019, 6:27am UTC](https://discourse.vtk.org/t/how-to-build-vtk-with-vtkparalleltimer/2228/1 "2019-12-07T06:27:24Z")
Could someone please explain how to get VTK to include **vtkParallelTimer**?
I’ve tried building with VTK\_USE\_MPI and adding a BOOL entry to CMake with
`VTK_RENDERINGPARALLELLIC_SURFACELICPAINTER_TIMER = ON`
and
`VTK_RENDERINGPARALLELLIC_LINEINTEGRALCONVLOLUTION2D_TIMER = ON`
but it doesn’t seem to work.
What am I missing?
---
### Author:  [@ben.boeckel](https://discourse.vtk.org/u/ben.boeckel)
#### Post date: [December 8, 2019, 11:56am UTC](https://discourse.vtk.org/t/how-to-build-vtk-with-vtkparalleltimer/2228/2 "2019-12-08T11:56:35Z")
There are no flags to enable specific classes in modules (nor should there ever be). The “should it build” flag is attached to the module itself. I’ve answered [on GitLab](https://gitlab.kitware.com/vtk/vtk/merge_requests/6122#note_664897) about how to enable logging for the module system to see why the module isn’t available.
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### Author:  [@toddy](https://discourse.vtk.org/u/toddy)
#### Post date: [December 8, 2019, 12:48pm UTC](https://discourse.vtk.org/t/how-to-build-vtk-with-vtkparalleltimer/2228/3 "2019-12-08T12:48:15Z")
I have now discovered that I had to manually add an entry to CMake for VTK\_MODULE\_ENABLE\_VTK\_RenderingParallelLIC which then automatically added boolean entries for `VTK_RENDERINGPARALLELLIC_SURFACELICPAINTER_TIMER` and `VTK_RENDERINGPARALLELLIC_LINEINTEGRALCONVLOLUTION2D_TIMER`
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### Author:  [@Paulo\_Carvalho](https://discourse.vtk.org/u/Paulo_Carvalho)
#### Post date: [December 8, 2019, 12:49pm UTC](https://discourse.vtk.org/t/how-to-build-vtk-with-vtkparalleltimer/2228/4 "2019-12-08T12:49:22Z")
> [@toddy](#):
>
> VTK\_RENDERINGPARALLELLIC\_LINEINTEGRAL **CONVLOLUTION** 2D\_TIMER
It seems there’s a typo in that name. Are you sure?
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### Author:  [@toddy](https://discourse.vtk.org/u/toddy)
#### Post date: [December 8, 2019, 12:51pm UTC](https://discourse.vtk.org/t/how-to-build-vtk-with-vtkparalleltimer/2228/5 "2019-12-08T12:51:34Z")
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### Author:  [@toddy](https://discourse.vtk.org/u/toddy)
#### Post date: [December 8, 2019, 12:54pm UTC](https://discourse.vtk.org/t/how-to-build-vtk-with-vtkparalleltimer/2228/6 "2019-12-08T12:54:21Z")
With these options ticked I can at least force vtkPLineIntegralConvolution2D and vtkPSurfaceLICComposite to build with vtkParallelTimer.
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### Author:  [@ben.boeckel](https://discourse.vtk.org/u/ben.boeckel)
#### Post date: [March 16, 2020, 2:59pm UTC](https://discourse.vtk.org/t/how-to-build-vtk-with-vtkparalleltimer/2228/7 "2020-03-16T14:59:27Z")
> [@Paulo\_Carvalho](#):
>
> It seems there’s a typo in that name.
Fixed here: [https://gitlab.kitware.com/vtk/vtk/-/merge\_requests/6579](https://gitlab.kitware.com/vtk/vtk/-/merge_requests/6579)