# 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:** 21

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**Author:** ![mertsaner](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mertsaner/32/13445_2.png) [@mertsaner](https://discourse.slicer.org/u/mertsaner)\
**Post date:** [December 22, 2021, 11:25pm UTC](https://discourse.slicer.org/t/3d-slicer-release-build-error-variable-slicer-wc-last-changed-date-is-expected-to-be-defined-in-slicerpackageanduploadtarget/20984/21 "2021-12-22T23:25:13Z")

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Hi,  
I receive this error when I try to build extensions using Cmake.

– Found Git: C:/Program Files/Git/cmd/git.exe  
– Looking for decorator header qSlicerOHModuleModuleWidgetsPythonQtDecorators.h  
– Looking for decorator header qSlicerOHModuleModuleWidgetsPythonQtDecorators.h - Not found  
– Configuring Loadable module: OHModule [qSlicerOHModuleModuleExport.h]  
CMake Warning (dev) at C:/D/S4/CMake/SlicerMacroExtractRepositoryInfo.cmake:75 (message):  
Skipping repository info extraction: directory [C:/dev/OHExtension/OH] is  
not a GIT or SVN checkout  
Call Stack (most recent call first):  
C:/D/S4/CMake/SlicerExtensionCPack.cmake:60 (SlicerMacroExtractRepositoryInfo)  
CMakeLists.txt:27 (include)  
This warning is for project developers. Use -Wno-dev to suppress it.

CMake Error at C:/D/S4/Extensions/CMake/SlicerFunctionGenerateExtensionDescription.cmake:70 (message):  
CMake variable EXTENSION\_WC\_REVISION is empty !  
Call Stack (most recent call first):  
C:/D/S4/CMake/SlicerExtensionCPack.cmake:79 (slicerFunctionGenerateExtensionDescription)  
CMakeLists.txt:27 (include)

– Configuring incomplete, errors occurred!  
See also “C:/dev/OHExtension/OHBuild/CMakeFiles/CMakeOutput.log”.  
See also “C:/dev/OHExtension/OHBuild/CMakeFiles/CMakeError.log”.

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