mlt: several improvements

1. Use lib.cmakeBool in cmakeFlags
2. Define in qt{5,6}-packages.nix more elgantly using callPackage
3. Always set all qt flags explicitly
4. Remove `libsForQt5.mlt` (should have been done in 084c1fefd8 version bump).

pkgs/by-name/ml/mlt/package.nix

@@ -32,7 +32,10 @@
   enablePython ? false,
   python3,
   swig,
-  qt ? null,
+  qtbase ? null,
+  wrapQtAppsHook ? null,
+  qtsvg ? null,
+  qt5compat ? null,
   enableSDL2 ? true,
   SDL2,
   gitUpdater,
@@ -59,6 +62,7 @@ stdenv.mkDerivation (finalAttrs: {
     pkg-config
     which
     makeWrapper
+    wrapQtAppsHook
   ]
   ++ lib.optionals cudaSupport [
     cudaPackages.cuda_nvcc
@@ -66,9 +70,6 @@ stdenv.mkDerivation (finalAttrs: {
   ++ lib.optionals enablePython [
     python3
     swig
-  ]
-  ++ lib.optionals (qt != null) [
-    qt.wrapQtAppsHook
   ];
 
   buildInputs = [
@@ -96,10 +97,10 @@ stdenv.mkDerivation (finalAttrs: {
     ladspa-sdk
     ladspaPlugins
   ]
-  ++ lib.optionals (qt != null) [
-    qt.qtbase
-    qt.qtsvg
-    (qt.qt5compat or null)
+  ++ lib.optionals (qtbase != null) [
+    qtbase
+    qtsvg
+    qt5compat
     libarchive
   ]
   ++ lib.optionals enableSDL2 [
@@ -114,31 +115,20 @@ stdenv.mkDerivation (finalAttrs: {
 
   cmakeFlags = [
     # RPATH of binary /nix/store/.../bin/... contains a forbidden reference to /build/
-    "-DCMAKE_SKIP_BUILD_RPATH=ON"
-    "-DMOD_OPENCV=ON"
+    (lib.cmakeBool "CMAKE_SKIP_BUILD_RPATH" true)
+    (lib.cmakeBool "MOD_OPENCV" true)
+    (lib.cmakeBool "MOD_QT6" (qtbase != null && lib.versions.major qtbase.version == "6"))
+    (lib.cmakeBool "MOD_GLAXNIMATE_QT6" (qtbase != null && lib.versions.major qtbase.version == "6"))
   ]
   ++ lib.optionals enablePython [
-    "-DSWIG_PYTHON=ON"
-  ]
-  ++ lib.optionals (qt == null) [
-    "-DMOD_QT6=OFF"
-  ]
-  ++ lib.optionals (qt != null && lib.versions.major qt.qtbase.version == "5") [
-    "-DMOD_QT=ON"
-    "-DMOD_QT6=OFF"
-    "-DMOD_GLAXNIMATE=ON"
-  ]
-  ++ lib.optionals (qt != null && lib.versions.major qt.qtbase.version == "6") [
-    "-DMOD_QT6=ON"
-    "-DMOD_QT=OFF"
-    "-DMOD_GLAXNIMATE_QT6=ON"
+    (lib.cmakeBool "SWIG_PYTHON" true)
   ];
 
   preFixup = ''
     wrapProgram $out/bin/melt \
       --prefix FREI0R_PATH : ${frei0r}/lib/frei0r-1 \
       ${lib.optionalString enableJackrack "--prefix LADSPA_PATH : ${ladspaPlugins}/lib/ladspa"} \
-      ${lib.optionalString (qt != null) "\${qtWrapperArgs[@]}"}
+      ${lib.optionalString (qtbase != null) "\${qtWrapperArgs[@]}"}
 
   '';
 

pkgs/top-level/qt5-packages.nix

@@ -110,10 +110,6 @@ makeScopeWithSplicing' {
 
         maplibre-native-qt = callPackage ../development/libraries/maplibre-native-qt { };
 
-        mlt = pkgs.mlt.override {
-          qt = qt5;
-        };
-
         polkit-qt = callPackage ../development/libraries/polkit-qt-1 { };
 
         poppler = callPackage ../development/libraries/poppler {
@@ -194,6 +190,7 @@ makeScopeWithSplicing' {
         timed = callPackage ../applications/system/timed { };
       }
       // lib.optionalAttrs config.allowAliases {
+        mlt = throw "'libsForQt5.mlt' was removed due to lack of upstream support since v7.36.0, use 'qt6Packages.mlt'."; # Added 2026-06-05
         futuresql = throw "libsForQt5.futuresql has been removed"; # Added 2026-05-01
         kdb = throw "libsForQt5.kdb has been removed"; # Added 2026-05-01
         kdiagram = throw "libsForQt5.kdiagram has been removed"; # Added 2026-05-01

pkgs/top-level/qt6-packages.nix

@@ -86,9 +86,7 @@ makeScopeWithSplicing' {
       };
 
       libquotient = callPackage ../development/libraries/libquotient { };
-      mlt = pkgs.mlt.override {
-        qt = qt6;
-      };
+      mlt = callPackage ../by-name/ml/mlt/package.nix { };
 
       maplibre-native-qt = callPackage ../development/libraries/maplibre-native-qt { };