After recent world update, GNS3 has been failing to start providing the following error messages: --- pkg_resources.ContextualVersionConflict: (jsonschema 3.0.1 (/usr/lib64/python3.6/site-packages), Requirement.parse('jsonschema==2.6.0'), {'gns3-gui'}) pkg_resources.DistributionNotFound: The 'jsonschema==2.6.0' distribution was not found and is required by gns3-gui --- There is a similar with net-misc/gns3-gui-2.1.21, which also requires exact dev-python/jsonschema-2.6.0 and dev-python/prompt_toolkit-1.0.15 versions: --- pkg_resources.ContextualVersionConflict: (prompt-toolkit 2.0.7 (/usr/lib64/python3.6/site-packages), Requirement.parse('prompt-toolkit==1.0.15'), {'gns3-server'}) pkg_resources.DistributionNotFound: The 'prompt-toolkit==1.0.15' distribution was not found and is required by gns3-server --- Fixing the needed versions in package.mask solves the problems: $ cat /etc/portage/package.mask >dev-python/jsonschema-2.6.0 >dev-python/prompt_toolkit-1.0.15 Below are full lists of requirements: $ cat /usr/lib64/python3.6/site-packages/gns3_gui-2.1.21-py3.6.egg-info/requires.txt jsonschema==2.6.0 raven>=5.23.0 psutil>=2.2.1 $ cat /usr/lib64/python3.6/site-packages/gns3_server-2.1.21-py3.6.egg-info/requires.txt jsonschema==2.6.0 aiohttp<2.4.0,>=2.3.3 aiohttp-cors==0.6.0 Jinja2>=2.7.3 raven>=5.23.0 psutil>=3.0.0 zipstream>=1.1.4 prompt-toolkit==1.0.15 async-timeout<3.0.0
version dropped from tree.
