Specifying local dependency with Poetry

Hi,

I have installed a package, 'first-package, built using Poetry and
installed it as root in /usr/local.  The package is on sys.path so root
can successfully import it.

I have now developed a second package which depends on 'first-package'.
I would have expected that I could specify this dependency in
pyproj.toml via

[tool.poetry.dependencies]
python = "^3.6"
first-package = "^1.6.0"

However, if I do that and then attempt to install the second package, I
get the error

  Could not find a version that satisfies the requirement first-package<2.0.0,>=1.6.0 (from second-package==0.5.0) (from versions: )
No matching distribution found for first-package<2.0.0,>=1.6.0 (from second-package==0.5.0)

How should I define the dependency?

Cheers,

Loris

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