# Extension build failure on Mac due to error copying files

**URL:** <https://discourse.slicer.org/t/extension-build-failure-on-mac-due-to-error-copying-files/935>\
**Category:** Development\
**Created:** [August 24, 2017, 1:44pm UTC](https://discourse.slicer.org/t/extension-build-failure-on-mac-due-to-error-copying-files/935 "2017-08-24T13:44:03Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [August 24, 2017, 1:44pm UTC](https://discourse.slicer.org/t/extension-build-failure-on-mac-due-to-error-copying-files/935/1 "2017-08-24T13:44:03Z")

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There is a strange error for some of the extensions on Mac stating that files could not be copied, such as  
`Error copying file "@rpath/libMRMLCore.dylib" to "/.../SlicerRT-build/inner-build/_CPack_Packages/Darwin/TGZ/26298-macosx-amd64-SlicerRT-svn3210-2017-08-21/Slicer.app/Contents/lib/Slicer-4.7/libMRMLCore.dylib".`

This happens for SlicerRT, but for other extensions as well  
[http://slicer.cdash.org/viewBuildError.php?buildid=1085258](http://slicer.cdash.org/viewBuildError.php?buildid=1085258)  
[http://slicer.cdash.org/viewBuildError.php?buildid=1085341](http://slicer.cdash.org/viewBuildError.php?buildid=1085341) (DCMQI)  
[http://slicer.cdash.org/viewBuildError.php?buildid=1085316](http://slicer.cdash.org/viewBuildError.php?buildid=1085316) (PETDICOMExtension)  
[http://slicer.cdash.org/viewBuildError.php?buildid=1085367](http://slicer.cdash.org/viewBuildError.php?buildid=1085367) (UKFTractography)  
[http://slicer.cdash.org/viewBuildError.php?buildid=1085372](http://slicer.cdash.org/viewBuildError.php?buildid=1085372) (SPHARM-PDM)

Although this seems like a random error, it’s not only across extensions but happening in the last three days, suggesting this won’t go away by itself  
08.23: [http://slicer.cdash.org/viewBuildError.php?buildid=1084455](http://slicer.cdash.org/viewBuildError.php?buildid=1084455)  
08.22: [http://slicer.cdash.org/viewBuildError.php?buildid=1083918](http://slicer.cdash.org/viewBuildError.php?buildid=1083918)

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**Author:** ![jcfr](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jcfr/32/17825_2.png) [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Post date:** [August 24, 2017, 2:04pm UTC](https://discourse.slicer.org/t/extension-build-failure-on-mac-due-to-error-copying-files/935/2 "2017-08-24T14:04:15Z")

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Hi Csaba,

That will be fixed by [https://github.com/Slicer/Slicer/pull/780](https://github.com/Slicer/Slicer/pull/780)

Jc

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [August 24, 2017, 2:07pm UTC](https://discourse.slicer.org/t/extension-build-failure-on-mac-due-to-error-copying-files/935/3 "2017-08-24T14:07:48Z")

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Ahh, excellent, thanks 🙂

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**Author:** ![fedorov](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/fedorov/32/14_2.png) [@fedorov](https://discourse.slicer.org/u/fedorov)\
**Post date:** [August 24, 2017, 6:05pm UTC](https://discourse.slicer.org/t/extension-build-failure-on-mac-due-to-error-copying-files/935/4 "2017-08-24T18:05:14Z")

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See earlier discussion here: [Interpreting CDash reporting: extension is packaged despite build errors?](https://discourse.slicer.org/t/interpreting-cdash-reporting-extension-is-packaged-despite-build-errors/856)

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<div class="post-metadata">

**Author:** ![jcfr](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jcfr/32/17825_2.png) [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Post date:** [August 24, 2017, 6:41pm UTC](https://discourse.slicer.org/t/extension-build-failure-on-mac-due-to-error-copying-files/935/5 "2017-08-24T18:41:20Z")

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This should be fixed in [r26301](http://viewvc.slicer.org/viewvc.cgi/Slicer4?view=revision&revision=26301)

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<div class="post-metadata">

**Author:** ![jcfr](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jcfr/32/17825_2.png) [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Post date:** [August 25, 2017, 5:57pm UTC](https://discourse.slicer.org/t/extension-build-failure-on-mac-due-to-error-copying-files/935/6 "2017-08-25T17:57:03Z")

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And here is a follow up commit addressing the remaining issues in Slicer. See [r26305](http://viewvc.slicer.org/viewvc.cgi/Slicer4?view=revision&revision=26305)

Corresponding changes in upstream projects are here:

- ITK: [http://review.source.kitware.com/#/c/22583/](http://review.source.kitware.com/#/c/22583/)
- CTK: [https://github.com/commontk/CTK/pull/745/commits/2b71958a424f7fff01b248aaebce0bcdb4dd25ed](https://github.com/commontk/CTK/pull/745/commits/2b71958a424f7fff01b248aaebce0bcdb4dd25ed)
- MINC: [https://github.com/BIC-MNI/libminc/pull/87](https://github.com/BIC-MNI/libminc/pull/87)