kdePackages.spectacle: fix OCR runtime loading (#512240)

{

  lib,

  fetchpatch,

  mkKdeDerivation,

  pkg-config,

  qtwayland,

  qtmultimedia,

  opencv,

  tesseractLanguages ? [ ],

  tesseract5,

}:

let

  tesseract = tesseract5.override { enableLanguages = tesseractLanguages; };

in

mkKdeDerivation {

  pname = "spectacle";

  # Backport the upstream switch from runtime QLibrary loading to direct

  # linking so Spectacle OCR can find Tesseract reliably on NixOS.

  patches = [

    (fetchpatch {

      url = "https://invent.kde.org/graphics/spectacle/-/commit/13b0be099e7abe9bbb17b90e62c2e83afb248db7.patch";

      hash = "sha256-HEgHsuajaF+WVMiRp0YKRmi+/NsIy5s8frwMJRIdDY8=";

    })

  ];

  extraNativeBuildInputs = [ pkg-config ];

  extraBuildInputs = [

    (tesseract5.override { enableLanguages = tesseractLanguages; })

    qtwayland

    qtmultimedia

    (opencv.override {

    })

  ];

  # no point adding the dependency when we have no language packs

  preFixup = lib.optionalString (tesseractLanguages != [ ]) ''

    patchelf --add-needed libtesseract.so.5 --add-rpath ${tesseract}/lib $out/bin/spectacle

  '';

  meta.mainProgram = "spectacle";

}