It seems this is caused by a build fail due to incompatible dependencies. When running make install

jupyter-console 6.0.0 has requirement prompt-toolkit<2.1.0,>=2.0.0, but you'll have prompt-toolkit 1.0.15 which is incompatible.

When installing jupyter, jupyter-console 6.0.0 requires prompt-toolkit 2.0/2.1

When b0b2e12 was merged there was an incompatibility between ipython and jupyter-console so a requirement on ipython 6.5.0 and prompt-toolkit 1.0.15 was made.

The build runs fine for me locally if you either rollback the requirement of jupyter-console to 5.2.0 meaning:

• jupyter-console==5.2.0
• ipython==6.5.0
• prompt-toolkit==1.0.15

or since the problem has since been patched, upgrade everything and use prompt-toolkit 2

• jupyter-console>=6.0.0
• ipython>=7.0.0
• prompt-toolkit>=2.0.0

I assume the documentation builds will work after that as that seems to be where the log stops.