# SITK : can it be ignored while building?

**URL:** <https://discourse.slicer.org/t/sitk-can-it-be-ignored-while-building/6260>\
**Category:** Support\
**Created:** [March 24, 2019, 10:19am UTC](https://discourse.slicer.org/t/sitk-can-it-be-ignored-while-building/6260 "2019-03-24T10:19:31Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![chir.set](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/chir.set/32/66982_2.png) [@chir.set](https://discourse.slicer.org/u/chir.set)\
**Post date:** [March 24, 2019, 10:19am UTC](https://discourse.slicer.org/t/sitk-can-it-be-ignored-while-building/6260/1 "2019-03-24T10:19:31Z")

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I understood from comments in the forum, perhaps wrongly, that SITK can be excluded while building Slicer.

How far is this true ? If so, how would it impact Slicer’s usability ? What would be missing?

It’s just that it’s a long CPU intensive build.

Using Linux.

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [March 24, 2019, 2:08pm UTC](https://discourse.slicer.org/t/sitk-can-it-be-ignored-while-building/6260/2 "2019-03-24T14:08:31Z")

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Yes, you can safely turn off Slicer\_USE\_SimpleITK when building to save time. A few things won’t be available in the build, like SimpleFilters and WatershedFromMarkerEffect, but most things will work.