pythonPackages.imgaug doesn't build due to missing dependencies

[CMCDragonkai]

Issue description

With the latest update on imgaug. The 0.2.8 version doesn't build.

It reports an error from 19.03:

Collecting opencv-python (from imgaug==0.2.8)
  Could not find a version that satisfies the requirement opencv-python (from imgaug==0.2.8) (from versions: )
No matching distribution found for opencv-python (from imgaug==0.2.8)

From master it reports:

Collecting imageio (from imgaug==0.2.8)
  Could not find a version that satisfies the requirement imageio (from imgaug==0.2.8) (from versions: )
No matching distribution found for imageio (from imgaug==0.2.8)
builder for '/nix/store/1v8vnhvc2z475czbywmnn231nz7chh09-python3.7-imgaug-0.2.8.drv' failed with exit code 1
error: build of '/nix/store/1v8vnhvc2z475czbywmnn231nz7chh09-python3.7-imgaug-0.2.8.drv' failed

Steps to reproduce

Try building pkgs.python3Packages.imgaug from the latest master/19.03.

Technical details

Please run nix-shell -p nix-info --run "nix-info -m" and paste the
results.

 - system: `"x86_64-linux"`
 - host os: `Linux 4.19.31, Formbay ML 2 A, noversion`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.2`
 - channels(root): `""`
 - nixpkgs: `/etc/nixos/nixpkgs`

[CMCDragonkai]

The imgaug needs to be fixed.

It needs some extra dependencies:

    install_requires=["scipy", "scikit-image>=0.14.2", "numpy>=1.15.0", "six", "imageio", "Pillow", "matplotlib",
                      "Shapely", "opencv-python-headless"],

This means we need to add in imageio and Shapely. Also 0.2.9 has changed to using opencv-python-headless.

The quickest way to deal with this is to rollback to 0.2.6, because at that point it actually worked.

aleju/imgaug#379 - I'm asking whether the library can just work with the normal opencv3 bindings.

[CMCDragonkai]

@FRidh are we able to rollback to 0.2.6 until we figure out a proper way of building 0.2.9 and addressing the opencv issue?

[CMCDragonkai]

According to aleju/imgaug#379 (comment) if we patch the package to refer to the official opencv bindings then everything should work.

[CMCDragonkai]

This is now fixed in: #67494