diff --git a/nixos/modules/services/x11/desktop-managers/kde5.nix b/nixos/modules/services/x11/desktop-managers/kde5.nix
index 538300f5793a..060dda1a70a8 100644
--- a/nixos/modules/services/x11/desktop-managers/kde5.nix
+++ b/nixos/modules/services/x11/desktop-managers/kde5.nix
@@ -170,7 +170,9 @@ in
     services.xserver.displayManager.sddm = {
       theme = "breeze";
       themes = [
+        kde5.extra-cmake-modules # for the setup-hook
         kde5.plasma-workspace
+        kde5.breeze-icons
         (kde5.oxygen-icons or kde5.oxygen-icons5)
       ];
     };
diff --git a/pkgs/applications/display-managers/sddm/default.nix b/pkgs/applications/display-managers/sddm/default.nix
index 8e1812ec013b..923b185ae393 100644
--- a/pkgs/applications/display-managers/sddm/default.nix
+++ b/pkgs/applications/display-managers/sddm/default.nix
@@ -68,14 +68,19 @@ in
 
 stdenv.mkDerivation {
   name = "sddm-${version}";
-  phases = "installPhase";
 
   nativeBuildInputs = [ lndir makeQtWrapper ];
   buildInputs = [ unwrapped ] ++ themes;
   themes = map (pkg: pkg.out or pkg) themes;
   inherit unwrapped;
 
+  unpackPhase = "true";
+  configurePhase = "runHook preConfigure; runHook postConfigure";
+  buildPhase = "runHook preBuild; runHook postBuild";
+
   installPhase = ''
+    runHook preInstall
+
     makeQtWrapper "$unwrapped/bin/sddm" "$out/bin/sddm"
 
     mkdir -p "$out/share/sddm"
@@ -85,6 +90,8 @@ stdenv.mkDerivation {
             lndir -silent "$sddmDir" "$out/share/sddm"
         fi
     done
+
+    runHook postInstall
   '';
 
   inherit (unwrapped) meta;
diff --git a/pkgs/desktops/kde-5/frameworks-5.22/extra-cmake-modules/setup-hook.sh b/pkgs/desktops/kde-5/frameworks-5.22/extra-cmake-modules/setup-hook.sh
index 49ac5d0c8b5f..aab0625bf61a 100644
--- a/pkgs/desktops/kde-5/frameworks-5.22/extra-cmake-modules/setup-hook.sh
+++ b/pkgs/desktops/kde-5/frameworks-5.22/extra-cmake-modules/setup-hook.sh
@@ -4,29 +4,48 @@ _ecmSetXdgDirs() {
     addToSearchPathOnce NIX_WRAP_XDG_CONFIG_DIRS "$1/etc/xdg"
 }
 
-_ecmPropagateSharedData() {
-    local sharedPaths=( \
-        "config.cfg" \
-        "kconf_update" \
-        "kservices5" \
-        "kservicetypes5" \
-        "knotifications5" \
-        "applications" \
-        "desktop-directories" \
-        "mime" \
-        "dbus-1" \
-        "interfaces" \
-        "services" \
-        "system-services" )
-    for dir in ${sharedPaths[@]}; do
+_ecmSharePaths=( \
+    "config.cfg" \
+    "kconf_update" \
+    "kservices5" \
+    "kservicetypes5" \
+    "knotifications5" \
+    "applications" \
+    "desktop-directories" \
+    "mime" \
+    "dbus-1" \
+    "interfaces" \
+    "services" \
+    "system-services" )
+
+_ecmPropagateNative() {
+    for dir in ${_ecmSharePaths[@]}; do
         if [ -d "$1/share/$dir" ]; then
-            addToSearchPathOnce NIX_WRAP_XDG_DATA_DIRS "$1/share"
-            propagateOnce propagatedUserEnvPkgs "$1"
+            propagateOnce propagatedNativeBuildInputs "$1"
+            if [ -z "$crossConfig" ]; then
+                propagateOnce propagatedUserEnvPkgs "$1"
+                addToSearchPathOnce NIX_WRAP_XDG_DATA_DIRS "$1/share"
+            fi
             break
         fi
     done
 }
 
+envHooks+=(_ecmSetXdgDirs _ecmPropagate)
+
+_ecmPropagate() {
+    for dir in ${_ecmSharePaths[@]}; do
+        if [ -d "$1/share/$dir" ]; then
+            propagateOnce propagatedBuildInputs "$1"
+            propagateOnce propagatedUserEnvPkgs "$1"
+            addToSearchPathOnce NIX_WRAP_XDG_DATA_DIRS "$1/share"
+            break
+        fi
+    done
+}
+
+crossEnvHooks+=(_ecmPropagate)
+
 _ecmConfig() {
     # Because we need to use absolute paths here, we must set *all* the paths.
     cmakeFlags+=" -DKDE_INSTALL_EXECROOTDIR=${!outputBin}"
@@ -70,5 +89,4 @@ _ecmConfig() {
     cmakeFlags+=" -DKDE_INSTALL_AUTOSTARTDIR=${!outputLib}/etc/xdg/autostart"
 }
 
-envHooks+=(_ecmSetXdgDirs _ecmPropagateSharedData)
 preConfigureHooks+=(_ecmConfig)
diff --git a/pkgs/development/libraries/qt-5/5.6/qtbase/setup-hook.sh b/pkgs/development/libraries/qt-5/5.6/qtbase/setup-hook.sh
index 4d2119bd0bcb..8d1a453787fb 100644
--- a/pkgs/development/libraries/qt-5/5.6/qtbase/setup-hook.sh
+++ b/pkgs/development/libraries/qt-5/5.6/qtbase/setup-hook.sh
@@ -24,7 +24,7 @@ propagateOnce() {
     addToSearchPathOnceWithCustomDelimiter ' ' "$@"
 }
 
-_qtPropagateRuntimeDependencies() {
+_qtPropagate() {
     for dir in "lib/qt5/plugins" "lib/qt5/qml" "lib/qt5/imports"; do
         if [ -d "$1/$dir" ]; then
             propagateOnce propagatedBuildInputs "$1"
@@ -37,7 +37,26 @@ _qtPropagateRuntimeDependencies() {
     addToSearchPathOnce QML2_IMPORT_PATH "$1/lib/qt5/qml"
 }
 
-envHooks+=(_qtPropagateRuntimeDependencies)
+crossEnvHooks+=(_qtPropagate)
+
+_qtPropagateNative() {
+    for dir in "lib/qt5/plugins" "lib/qt5/qml" "lib/qt5/imports"; do
+        if [ -d "$1/$dir" ]; then
+            propagateOnce propagatedNativeBuildInputs "$1"
+            if [ -z "$crossConfig" ]; then
+                propagateOnce propagatedUserEnvPkgs "$1"
+            fi
+            break
+        fi
+    done
+    if [ -z "$crossConfig" ]; then
+        addToSearchPathOnce QT_PLUGIN_PATH "$1/lib/qt5/plugins"
+        addToSearchPathOnce QML_IMPORT_PATH "$1/lib/qt5/imports"
+        addToSearchPathOnce QML2_IMPORT_PATH "$1/lib/qt5/qml"
+    fi
+}
+
+envHooks+=(_qtPropagateNative)
 
 _qtMultioutDevs() {
     # This is necessary whether the package is a Qt module or not