[SOLVED] How can I pip install pyx package from externally hosted source?

How can I pip install pyx package from externally hosted source?

Pip knows about the pyx package:

$ pip search pyx
PyX - Python package for the generation of PostScript and PDF files

Trying to install it gives an error:

$ pip install pyx
Collecting pyx
  Could not find any downloads that satisfy the requirement pyx
  Some externally hosted files were ignored as access to them may be unreliable (use --allow-external pyx to allow).
  No distributions at all found for pyx

I followed the error message and used --allow-external pyx, but got a different error:

$ pip install --allow-external pyx
You must give at least one requirement to install (see "pip help install")

How can I use pip to install the pyx package?

Solution

You need to tell pip to both allow the external pyx package and to actually install it.

pip install --allow-external pyx pyx

Written in that order, it seems redundant, but the package name to install is separate from the --allow-external option.