# 3D Slicer Release Build Error (Variable Slicer\_WC\_LAST\_CHANGED\_DATE is expected to be defined in SlicerPackageAndUploadTarget)

**URL:** <https://discourse.slicer.org/t/3d-slicer-release-build-error-variable-slicer-wc-last-changed-date-is-expected-to-be-defined-in-slicerpackageanduploadtarget/20984>\
**Category:** Development\
**Tags:** cmake\
**Created:** [December 9, 2021, 9:24pm UTC](https://discourse.slicer.org/t/3d-slicer-release-build-error-variable-slicer-wc-last-changed-date-is-expected-to-be-defined-in-slicerpackageanduploadtarget/20984 "2021-12-09T21:24:25Z")\
**Posts on this page:** 1\
**Showing post:** 23

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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:** [December 23, 2021, 4:34pm UTC](https://discourse.slicer.org/t/3d-slicer-release-build-error-variable-slicer-wc-last-changed-date-is-expected-to-be-defined-in-slicerpackageanduploadtarget/20984/23 "2021-12-23T16:34:31Z")

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If you are not using revision control then you can specify working copy version CMake variables manually when you configure your project, either using the CMake GUI or by adding these arguments when you call cmake.exe:

```
-DYourExtensionName_WC_REVISION:STRING=100 -DEXTENSION_WC_REVISION:STRING=100

```

(replace `YourExtensionName` and `100` with the actual name of your extension and a revision number)

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_[View the full topic](https://discourse.slicer.org/t/3d-slicer-release-build-error-variable-slicer-wc-last-changed-date-is-expected-to-be-defined-in-slicerpackageanduploadtarget/20984)._