Not sure why that happens. Also, it complains that "package directory 'outputlilypond' does not exist". Here is the full output in case it is relevant:
Downloading/unpacking vis-framework
Running setup.py (path:/tmp/pip_build_albert/vis-framework/setup.py) egg_info for package vis-framework
error: package directory 'outputlilypond' does not exist
Complete output from command python setup.py egg_info:
running egg_info
creating pip-egg-info/vis_framework.egg-info
writing requirements to pip-egg-info/vis_framework.egg-info/requires.txt
writing pip-egg-info/vis_framework.egg-info/PKG-INFO
writing top-level names to pip-egg-info/vis_framework.egg-info/top_level.txt
writing dependency_links to pip-egg-info/vis_framework.egg-info/dependency_links.txt
writing manifest file 'pip-egg-info/vis_framework.egg-info/SOURCES.txt'
warning: manifest_maker: standard file '-c' not found
error: package directory 'outputlilypond' does not exist
----------------------------------------
Cleaning up...
Command python setup.py egg_info failed with error code 1 in /tmp/pip_build_albert/vis-framework
Storing debug log for failure in /tmp/tmp0ZUAzZ
Not sure why that happens. Also, it complains that "package directory 'outputlilypond' does not exist". Here is the full output in case it is relevant: