diff --git a/pkgs/desktops/lxqt/lxqt-config/default.nix b/pkgs/desktops/lxqt/lxqt-config/default.nix
index 55239caf2bd1..727ae6358599 100644
--- a/pkgs/desktops/lxqt/lxqt-config/default.nix
+++ b/pkgs/desktops/lxqt/lxqt-config/default.nix
@@ -1,6 +1,7 @@
 { lib
 , mkDerivation
 , fetchFromGitHub
+, fetchpatch
 , cmake
 , pkg-config
 , glib
@@ -29,6 +30,17 @@ mkDerivation rec {
     sha256 = "WgrcHM4iJLZsJO2obqSkjHHMB+/kcadQArkcXC5FB24=";
   };
 
+  patches = [
+    # FIXME: backport Plasma 5.27 build fix, remove for next release
+    (fetchpatch {
+      url = "https://github.com/lxqt/lxqt-config/commit/6add4e4f0040693e7c4242fbae48c9d32007686c.diff";
+      hash = "sha256-Tir4KeGhBnD9dYmB1FAjuf4R4V+rn12MOxsRwTdE0Sc=";
+    })
+  ];
+
+  # FIXME: required to build with Plasma 5.27, which uses std::optional
+  cmakeFlags = ["-DCMAKE_CXX_STANDARD=17"];
+
   nativeBuildInputs = [
     cmake
     pkg-config