Building artifacts...
cd doc-src && ./make_doc
The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
Configuration file: /home/circleci/project/doc-src/_config.yml
Source: /home/circleci/project/doc-src
Destination: /home/circleci/project/doc-src/_site
Incremental build: disabled. Enable with --incremental
Generating...
jekyll 3.8.7 | Error: Broken pipe - Failed to read response from Python process on a mentos css call: pyenv: python3: command not found
The `python3' command exists in these Python versions:
3.5.2
3.6.5
3.7.0
Makefile:25: recipe for target 'doc' failed
make: *** [doc] Error 1
Exited with code exit status 2
CircleCI received exit code 2
Huh?