kdePackages.kde-gtk-config: hardcode more dependency paths

pkgs/kde/plasma/kde-gtk-config/default.nix

@@ -1,5 +1,9 @@
 {
+  lib,
   mkKdeDerivation,
+  substituteAll,
+  procps,
+  xsettingsd,
   pkg-config,
   wrapGAppsHook3,
   sass,
@@ -11,7 +15,17 @@ mkKdeDerivation {
 
   # The gtkconfig KDED module will crash the daemon if the GSettings schemas
   # aren't found.
-  patches = [./0001-gsettings-schemas-path.patch];
+  patches = [
+    ./0001-gsettings-schemas-path.patch
+    (
+      substituteAll {
+        src = ./dependency-paths.patch;
+        pgrep = lib.getExe' procps "pgrep";
+        xsettingsd = lib.getExe xsettingsd;
+      }
+    )
+  ];
+
   preConfigure = ''
     NIX_CFLAGS_COMPILE+=" -DGSETTINGS_SCHEMAS_PATH=\"$GSETTINGS_SCHEMAS_PATH\""
   '';
@@ -21,4 +35,10 @@ mkKdeDerivation {
   dontWrapGApps = true; # There is nothing to wrap
 
   extraCmakeFlags = ["-DGLIB_SCHEMAS_DIR=${gsettings-desktop-schemas.out}/"];
+
+  # Hardcoded as QStrings, which are UTF-16 so Nix can't pick these up automatically
+  postFixup = ''
+    mkdir -p $out/nix-support
+    echo "${procps} ${xsettingsd}" > $out/nix-support/depends
+  '';
 }

pkgs/kde/plasma/kde-gtk-config/dependency-paths.patch

@@ -0,0 +1,22 @@
+diff --git a/kded/config_editor/xsettings.cpp b/kded/config_editor/xsettings.cpp
+index 1f9fe5b..9824973 100644
+--- a/kded/config_editor/xsettings.cpp
++++ b/kded/config_editor/xsettings.cpp
+@@ -46,7 +46,7 @@ void replaceValueInXSettingsdContents(QString &xSettingsdContents, const QString
+ pid_t pidOfXSettingsd()
+ {
+     QProcess pgrep;
+-    pgrep.start(QStringLiteral("pgrep"),
++    pgrep.start(QStringLiteral("@pgrep@"),
+                 QStringList{
+                     QStringLiteral("-u"),
+                     QString::number(getuid()),
+@@ -67,7 +67,7 @@ reloadXSettingsd(void *)
+ {
+     pid_t xSettingsdPid = pidOfXSettingsd();
+     if (xSettingsdPid == 0) {
+-        QProcess::startDetached(QStandardPaths::findExecutable(QStringLiteral("xsettingsd")), QStringList());
++        QProcess::startDetached(QStringLiteral("@xsettingsd@"), QStringList());
+     } else {
+         kill(xSettingsdPid, SIGHUP);
+     }