[bug#55085] [PATCH] gfeeds 0.16.2: Make it run

[Luis Felipe]

This program fails to run. I attach a patch that makes it work.

SYSTEM INFORMATION

Guix system with the following Guix.

Generation 55   Apr 18 2022 11:42:09    (current)
  guix 237d90a
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: 237d90a7808cfdced34b34595eba16632cbcb89e


STEPS TO REPRODUCE

guix shell gfeeds -- gfeeds
Traceback (most recent call last):
  File 
"/gnu/store/8vbjfdq9dv8cscs28vq9iabmkz4zkqcg-gfeeds-0.16.2/bin/.gfeeds-real", 
line 64, in <module>
    gi.require_version('WebKit2', '4.0')
  File "/home/yo/.guix-profile/lib/python3.9/site-packages/gi/__init__.py", 
line 129, in require_version
    raise ValueError('Namespace %s not available for version %s' %
ValueError: Namespace WebKit2 not available for version 4.0


ADDITIONAL INFORMATION

The problem seems to be that the current inputs of gfeeds don't provide WebKit2 
4.0 but WebKit 4.1:

❯ guix shell python-pygobject webkitgtk

yo@gnu[env]: ~❯ python3
Python 3.9.9 (main, Jan  1 1970, 00:00:01) 

[GCC 10.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import gi
>>> 

>>> # The following fails.
>>> gi.require_version("WebKit2", "4.0")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/yo/.guix-profile/lib/python3.9/site-packages/gi/__init__.py", 
line 129, in require_version
    raise ValueError('Namespace %s not available for version %s' %
ValueError: Namespace WebKit2 not available for version 4.0
>>> 

>>> 

>>> # But the following works.
>>> gi.require_version("WebKit2", "4.1")
>>> 



POSSIBLE SOLUTION

I attach a patch that makes the program import WebKit 4.1 instead. This makes 
the program work. As far as I could see, there is no package in Guix that 
provides WebKit 4.0, so I left the inputs untouched.

Another option was to upgrade gfeeds to the latest (v1.0.2), but it required to 
package new libraries that are not available in Guix (a recent libadwaita, for 
example), and which I'm not able to package.


Best,

---
Luis Felipe López Acevedo
https://luis-felipe.gitlab.io/

0001-gnu-gfeeds-Make-it-start.patch
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