Screenshot with mss in python says "No X11 Library"

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3

Hi and thank you for your detailed answer. Very much appreciate it.
But unfortunately this also does also not work within propagatedBuildInputs. (though I figured out the difference now :slight_smile:

Tried to use it from the python interpreter and found that this:

#!/usr/bin/env python3
import ctypes.util
x11 = ctypes.util.find_library("X11")
if not x11:
    print("No X11.")

Needs LD_LIBRARY_PATH to be set correctly:

[I] ➜ .config/nixpkgs/bin/minimal.py
No X11.

[I] ➜ LD_LIBRARY_PATH=/nix/store/7gxlcshan16fym2ay98zmpi9gz7sjkdx-libX11-1.7.0/lib .config/nixpkgs/bin/minimal.py

And then i found out running it like this makes it work:

LD_LIBRARY_PATH=$HOME/.nix-profile/lib .config/nixpkgs/bin/minimal.py

I’ll then just set this in the script calling it.
But I’m confused.
Where should this be set?
In the lib package? I tried this but didn’t have an effect:

  propagatedBuildInputs = [
    xorg.libX11
    xorg.xrandr
  ];
  LD_LIBRARY_PATH = "${lib.makeLibraryPath propagatedBuildInputs}";

probably that path is also build time only.