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For ollama, you can see from https://github.com/jmorganca/ollama/blob/325cfcd9ffa8c5e19c7258471a864dcd8508d49a/docs/linux.md that it can be installed by downloading a binary and putting that binary in the right directory. So something like the derivation below should work for a quick trial. (But it’s probably better to try and build it from source.)

{ fetchurl, lib, stdenv, autoPatchelfHook }:

stdenv.mkDerivation rec {
  pname = "ollama";
  version = "0.1"; #Change this!
  src = fetchurl {
    url = "https://ollama.ai/download/ollama-linux-amd64";
    hash = "sha256-WxRimPMHV2qbePUu9EVniApXy2NrLK97LsXO+Burdkk=";
  };

  nativeBuildInputs = [
    autoPatchelfHook
  ];

  dontUnpack = true;
  dontBuild = true;
  dontConfigure = true;

  installPhase = ''
    mkdir -p $out/bin
    install -m755 -D $src $out/bin/ollama
  '';

  meta = with lib; {
    homepage = "https://ollama.ai/";
    description = "Enter Something Here";
    platforms = platforms.linux;
  };
}

You may have to add some libraries to buildInputs, though. For packaging binaries, you can also consult this: Packaging/Binaries - NixOS Wiki

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