# build fails while downloading external data file

**URL:** https://discourse.vtk.org/t/build-fails-while-downloading-external-data-file/1371
**Category:** Support
**Created:** [July 18, 2019, 6:40am UTC](https://discourse.vtk.org/t/build-fails-while-downloading-external-data-file/1371 "2019-07-18T06:40:35Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![andreasbuykx](https://discourse.vtk.org/user_avatar/discourse.vtk.org/andreasbuykx/32/8137_2.png) [@andreasbuykx](https://discourse.vtk.org/u/andreasbuykx)
#### Post date: [July 18, 2019, 6:40am UTC](https://discourse.vtk.org/t/build-fails-while-downloading-external-data-file/1371/1 "2019-07-18T06:40:35Z")

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It’s been a while since I’ve built VTK, and now I updated to 52157f40f47ce4f5be55f223258f1d7bfefcf60e and tried to build my squeaky clean clone of origin/master. I get a failure that some file cannot be downloaded:

```auto
-- Fetching "https://data.kitware.com/api/v1/file/hashsum/SHA512/69f28b8d906844590b9ae02214f0d067fc2fec10519a6ddd9bd5fed1851e059bff29fb8c628d8277a506b4f93578b70bdb278fdf334c93ba82db1d4a1ce43006/download"
-- Fetching "https://www.vtk.org/files/ExternalData/SHA512/69f28b8d906844590b9ae02214f0d067fc2fec10519a6ddd9bd5fed1851e059bff29fb8c628d8277a506b4f93578b70bdb278fdf334c93ba82db1d4a1ce43006"
CMake Error at /opt/cmake-3.14.2/share/cmake-3.14/Modules/ExternalData.cmake:1121 (message):
  

  Object
  SHA512=69f28b8d906844590b9ae02214f0d067fc2fec10519a6ddd9bd5fed1851e059bff29fb8c628d8277a506b4f93578b70bdb278fdf334c93ba82db1d4a1ce43006
  not found at:

    https://data.kitware.com/api/v1/file/hashsum/SHA512/69f28b8d906844590b9ae02214f0d067fc2fec10519a6ddd9bd5fed1851e059bff29fb8c628d8277a506b4f93578b70bdb278fdf334c93ba82db1d4a1ce43006/download ("Unsupported protocol")
    https://www.vtk.org/files/ExternalData/SHA512/69f28b8d906844590b9ae02214f0d067fc2fec10519a6ddd9bd5fed1851e059bff29fb8c628d8277a506b4f93578b70bdb278fdf334c93ba82db1d4a1ce43006 ("Unsupported protocol")

```

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<div class="post-metadata">

### Author: ![ben.boeckel](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/b/ea5d25/32.png) [@ben.boeckel](https://discourse.vtk.org/u/ben.boeckel)
#### Post date: [July 18, 2019, 7:38am UTC](https://discourse.vtk.org/t/build-fails-while-downloading-external-data-file/1371/2 "2019-07-18T07:38:21Z")

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> [@andreasbuykx](#):
>
> Unsupported protocol

Your CMake doesn’t link against an OpenSSL-aware libcurl, so `https://` URLs are not allowed. Please update/rebuild your CMake with SSL support.

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<div class="post-metadata">

### Author: ![andreasbuykx](https://discourse.vtk.org/user_avatar/discourse.vtk.org/andreasbuykx/32/8137_2.png) [@andreasbuykx](https://discourse.vtk.org/u/andreasbuykx)
#### Post date: [July 18, 2019, 8:05am UTC](https://discourse.vtk.org/t/build-fails-while-downloading-external-data-file/1371/3 "2019-07-18T08:05:46Z")

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Thanks for the swift reply!