diff --git a/pkgs/by-name/ca/catppuccin-sddm-corners/package.nix b/pkgs/by-name/ca/catppuccin-sddm-corners/package.nix
index 0b8550de939f..e402e763397c 100644
--- a/pkgs/by-name/ca/catppuccin-sddm-corners/package.nix
+++ b/pkgs/by-name/ca/catppuccin-sddm-corners/package.nix
@@ -21,11 +21,12 @@ stdenvNoCC.mkDerivation {
   dontBuild = true;
   dontWrapQtApps = true;
 
-  propagatedUserEnvPkgs = with qt6; [
-    qt5compat
-    qtwayland
-    qtquick3d
-    qtsvg
+  propagatedBuildInputs = with qt6; [
+    # avoid .dev outputs propagation
+    qt5compat.out
+    qtwayland.out
+    qtquick3d.out
+    qtsvg.out
   ];
 
   installPhase = ''
diff --git a/pkgs/by-name/ca/catppuccin-sddm/package.nix b/pkgs/by-name/ca/catppuccin-sddm/package.nix
index 88a7152552ea..3afb73c99358 100644
--- a/pkgs/by-name/ca/catppuccin-sddm/package.nix
+++ b/pkgs/by-name/ca/catppuccin-sddm/package.nix
@@ -35,7 +35,8 @@ stdenvNoCC.mkDerivation (finalAttrs: {
   ];
 
   propagatedBuildInputs = [
-    kdePackages.qtsvg
+    # avoid .dev outputs propagation
+    kdePackages.qtsvg.out
   ];
 
   postPatch = ''
@@ -91,11 +92,6 @@ stdenvNoCC.mkDerivation (finalAttrs: {
     runHook postInstall
   '';
 
-  postFixup = ''
-    mkdir -p $out/nix-support
-    echo ${kdePackages.qtsvg} >> $out/nix-support/propagated-user-env-packages
-  '';
-
   meta = {
     description = "Soothing pastel theme for SDDM";
     homepage = "https://github.com/catppuccin/sddm";
diff --git a/pkgs/by-name/el/elegant-sddm/package.nix b/pkgs/by-name/el/elegant-sddm/package.nix
index aba9e5b902c2..2698963acff5 100644
--- a/pkgs/by-name/el/elegant-sddm/package.nix
+++ b/pkgs/by-name/el/elegant-sddm/package.nix
@@ -27,7 +27,8 @@ stdenvNoCC.mkDerivation {
 
   dontWrapQtApps = true;
   propagatedBuildInputs = [
-    kdePackages.qt5compat
+    # avoid .dev outputs propagation
+    kdePackages.qt5compat.out
   ];
 
   installPhase = ''
diff --git a/pkgs/by-name/no/nordic/package.nix b/pkgs/by-name/no/nordic/package.nix
index 418d526e703b..9369f13e7d9a 100644
--- a/pkgs/by-name/no/nordic/package.nix
+++ b/pkgs/by-name/no/nordic/package.nix
@@ -149,13 +149,11 @@ stdenvNoCC.mkDerivation {
   '';
 
   postFixup = ''
-    # Propagate sddm theme dependencies to user env otherwise sddm
-    # does not find them. Putting them in buildInputs is not enough.
-
     mkdir -p $sddm/nix-support
 
-    printWords ${kdePackages.breeze-icons} ${kdePackages.libplasma} ${kdePackages.plasma-workspace} \
-      >> $sddm/nix-support/propagated-user-env-packages
+    # avoid .dev outputs propagation
+    printWords ${kdePackages.breeze-icons.out} ${kdePackages.libplasma.out} ${kdePackages.plasma-workspace.out} \
+      >> $sddm/nix-support/propagated-build-inputs
   '';
 
   meta = {
diff --git a/pkgs/by-name/sd/sddm-chili-theme/package.nix b/pkgs/by-name/sd/sddm-chili-theme/package.nix
index 1708ec5ee2e4..24fab822e025 100644
--- a/pkgs/by-name/sd/sddm-chili-theme/package.nix
+++ b/pkgs/by-name/sd/sddm-chili-theme/package.nix
@@ -30,7 +30,9 @@ stdenv.mkDerivation {
   };
 
   propagatedBuildInputs = [
-    libsForQt5.qtgraphicaleffects
+    # avoid .dev outputs propagation
+    libsForQt5.qtgraphicaleffects.out
+    libsForQt5.qtquickcontrols.out
   ];
 
   dontWrapQtApps = true;
@@ -43,11 +45,6 @@ stdenv.mkDerivation {
     mv * $out/share/sddm/themes/chili/
   '';
 
-  postFixup = ''
-    mkdir -p $out/nix-support
-
-    echo ${libsForQt5.qtgraphicaleffects} >> $out/nix-support/propagated-user-env-packages
-  '';
   meta = {
     license = lib.licenses.gpl3;
     maintainers = with lib.maintainers; [ sents ];
diff --git a/pkgs/by-name/sd/sddm-sugar-dark/package.nix b/pkgs/by-name/sd/sddm-sugar-dark/package.nix
index 162f8e4ec266..ed9b093cd059 100644
--- a/pkgs/by-name/sd/sddm-sugar-dark/package.nix
+++ b/pkgs/by-name/sd/sddm-sugar-dark/package.nix
@@ -20,7 +20,10 @@ stdenvNoCC.mkDerivation (finalAttrs: {
 
   dontWrapQtApps = true;
 
-  buildInputs = with libsForQt5.qt5; [ qtgraphicaleffects ];
+  propagatedBuildInputs = [
+    # avoid .dev outputs propagation
+    libsForQt5.qtgraphicaleffects.out
+  ];
 
   installPhase =
     let
diff --git a/pkgs/by-name/ut/utterly-nord-plasma/package.nix b/pkgs/by-name/ut/utterly-nord-plasma/package.nix
index 6e27725a1c30..7a1755fe99fe 100644
--- a/pkgs/by-name/ut/utterly-nord-plasma/package.nix
+++ b/pkgs/by-name/ut/utterly-nord-plasma/package.nix
@@ -16,12 +16,15 @@ stdenv.mkDerivation {
     hash = "sha256-moLgBFR+BgoiEBzV3y/LA6JZfLHrG1weL1+h8LN9ztA=";
   };
 
-  propagatedUserEnvPkgs = with kdePackages; [
-    breeze-icons
-    kdeclarative
+  dontWrapQtApps = true;
+
+  propagatedBuildInputs = with kdePackages; [
+    # avoid .dev outputs propagation
+    qt5compat.out
     kirigami
-    libplasma
-    plasma-workspace
+    libplasma.out
+    plasma5support.out
+    plasma-workspace.out
   ];
 
   installPhase = ''
diff --git a/pkgs/by-name/wh/where-is-my-sddm-theme/package.nix b/pkgs/by-name/wh/where-is-my-sddm-theme/package.nix
index eb0fee939bc5..87041f4d3977 100644
--- a/pkgs/by-name/wh/where-is-my-sddm-theme/package.nix
+++ b/pkgs/by-name/wh/where-is-my-sddm-theme/package.nix
@@ -43,12 +43,13 @@ lib.checkListOfEnum "where-is-my-sddm-theme: variant" validVariants variants
       hash = "sha256-+R0PX84SL2qH8rZMfk3tqkhGWPR6DpY1LgX9bifNYCg=";
     };
 
-    propagatedUserEnvPkgs =
+    propagatedBuildInputs =
       [ ]
       ++ lib.optionals (lib.elem "qt5" variants) [ libsForQt5.qtgraphicaleffects ]
+      # avoid .dev outputs propagation
       ++ lib.optionals (lib.elem "qt6" variants) [
-        qt6.qt5compat
-        qt6.qtsvg
+        qt6.qt5compat.out
+        qt6.qtsvg.out
       ];
 
     installPhase = ''