ERROR: Command errored out with exit status 1:
     command: /home/daniel/workspace/sphinx/breathe/.venv/bin/python -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-req-build-mqj3ctdq/setup.py'"'"'; __file__='"'"'/tmp/pip-req-build-mqj3ctdq/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-cjlbra1y
         cwd: /tmp/pip-req-build-mqj3ctdq/
    Complete output (15 lines):
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-req-build-mqj3ctdq/setup.py", line 10, in <module>
        from breathe import __version__
      File "/tmp/pip-req-build-mqj3ctdq/breathe/__init__.py", line 1, in <module>
        from . import directives
      File "/tmp/pip-req-build-mqj3ctdq/breathe/directives.py", line 1, in <module>
        from breathe.directive.base import create_warning
      File "/tmp/pip-req-build-mqj3ctdq/breathe/directive/base.py", line 1, in <module>
        from breathe.finder.factory import FinderFactory
      File "/tmp/pip-req-build-mqj3ctdq/breathe/finder/__init__.py", line 1, in <module>
        from breathe.project import ProjectInfo
      File "/tmp/pip-req-build-mqj3ctdq/breathe/project.py", line 4, in <module>
        from sphinx.application import Sphinx
    ModuleNotFoundError: No module named 'sphinx'