qt6Packages.qzxing: Fix build

Upstream QMake code doesn't use the correct functions for version-gating code.

pkgs/development/libraries/qzxing/default.nix

@@ -19,6 +19,14 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-ASgsF5ocNWAiIy2jm6ygpDkggBcEpno6iVNWYkuWcVI=";
   };
 
+  # greaterThan/lessThan don't handle versions, use versionAtLeast/versionAtMost instead
+  # Versions are different due to versionAtLeast/-Most using an inclusive limit, while greater-/lessThan use exclusive ones
+  postPatch = ''
+    substituteInPlace src/QZXing-components.pri \
+      --replace-fail 'lessThan(QT_VERSION, 6.2)' 'versionAtMost(QT_VERSION, 6.1)' \
+      --replace-fail 'greaterThan(QT_VERSION, 6.1)' 'versionAtLeast(QT_VERSION, 6.2)'
+  '';
+
   # QMake can't find qtmultimedia in buildInputs
   strictDeps = false;