anchor.diff:  , python3Packages
   , fetchFromGitHub
   , python3
  +, fetchpatch
   }:
   
   # USAGE:
  
positive.code:     sed -i -e 's!numpy==[^"]*!numpy!' requirements.txt setup.py
      sed -i -e 's!umap-learn==[^"]*!umap-learn!' requirements.txt setup.py
      # Not required for building/installation but for their development/ci workflow
      sed -i -e '/pylint/d' requirements.txt
      sed -i -e '/cardboardlint/d' requirements.txt setup.py
    '';
  
negative.code: # # pick your favorite vocoder/tts model
  # $ tts-server --model_name tts_models/en/ljspeech/glow-tts --vocoder_name vocoder_models/universal/libri-tts/fullband-melgan
  #
  # If you upgrade from an old version you may have to delete old models from ~/.local/share/tts
  # Also note that your tts version might not support all available models so check:
  #   https://github.com/coqui-ai/TTS/releases/tag/v0.0.12
  #
  # For now, for deployment check the systemd unit in the pull request:
  #   https://github.com/NixOS/nixpkgs/pull/103851#issue-521121136
  
  python3Packages.buildPythonApplication rec {
    pname = "tts";
    version = "0.0.12";
  
    src = fetchFromGitHub {
      owner = "coqui-ai";
      repo = "TTS";
      rev = "v${version}";
      sha256 = "sha256-0M9wcdBmuTK+NvEGsXEdoYiVFjw8G2MRUwmi1PJgmzI=";
    };
  
    patches = [
      # https://github.com/coqui-ai/TTS/pull/435
      (fetchpatch {
        url = "https://github.com/coqui-ai/TTS/commit/97f98e4c4584ef14ed2f4885aa02c162d9364a00.patch";
        sha256 = "sha256-DAZYOOAe+6TYBF5ukFq5HRwm49askEvNEivuwb/oCWM=";
      })
    ];
  
    preBuild = ''
      # numba jit tries to write to its cache directory
  