# Build error - CTK CustomBuild failed

**URL:** <https://discourse.slicer.org/t/build-error-ctk-custombuild-failed/764>\
**Category:** Development\
**Created:** [July 25, 2017, 5:55pm UTC](https://discourse.slicer.org/t/build-error-ctk-custombuild-failed/764 "2017-07-25T17:55:20Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [July 25, 2017, 5:56pm UTC](https://discourse.slicer.org/t/build-error-ctk-custombuild-failed/764/2 "2017-07-25T17:56:34Z")

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Unfortunately, a change was introduced a few days ago that breaks debug-mode build on windows. See details here: [Slicer debug-mode buid error in 2017-07-23 version on Windows due to bzip2](https://discourse.slicer.org/t/slicer-debug-mode-buid-error-in-2017-07-23-version-on-windows-due-to-bzip2/751/5)

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_[View the full topic](https://discourse.slicer.org/t/build-error-ctk-custombuild-failed/764)._