install instructions don't work in fresh environment

[ptitzler]

In https://github.com/elyra-ai/pipeline-editor#installation

make clean dev-link install

yields

yarn link @elyra/pipeline-editor
yarn link v1.22.4
success Using linked package for "@elyra/pipeline-editor".
✨  Done in 0.05s.
cd node_modules/@elyra/pipeline-editor && jupyter labextension link --no-build .
/bin/bash: jupyter: command not found
make: *** [dev-link] Error 127

I completed the following steps in a fresh environment:

• git clone git@github.com:elyra-ai/pipeline-editor.git
• git clone git@github.com:elyra-ai/elyra.git
• cd pipeline-editor
• make clean install dev-link // fails; see above
• as a workaround I ran make install in elyra directory to get prerequisites in place
• make clean install dev-link // now succeeds in pipeline-editor directory
• make clean dev-link install // fails in elyra directory with

  [LabCleanApp] Removing staging...
  [LabCleanApp] Success!
  yarn link @elyra/pipeline-services
  yarn link v1.22.4
  error No registered package found called "@elyra/pipeline-services".
  info Visit https://yarnpkg.com/en/docs/cli/link for documentation about this command.  
  make: *** [dev-link] Error 1