diff --git a/pkgs/applications/maui/pix.nix b/pkgs/applications/maui/pix.nix
index b19c5dff7148..de57aaedbccf 100644
--- a/pkgs/applications/maui/pix.nix
+++ b/pkgs/applications/maui/pix.nix
@@ -1,23 +1,33 @@
-{ lib
-, mkDerivation
-, cmake
-, extra-cmake-modules
-, applet-window-buttons
-, karchive
-, kcoreaddons
-, ki18n
-, kio
-, kirigami2
-, mauikit
-, mauikit-filebrowsing
-, mauikit-imagetools
-, qtmultimedia
-, qtquickcontrols2
-, qtlocation
-, exiv2
-, kquickimageedit
+{
+  lib,
+  mkDerivation,
+  cmake,
+  extra-cmake-modules,
+  applet-window-buttons,
+  karchive,
+  kcoreaddons,
+  ki18n,
+  kio,
+  kirigami2,
+  mauikit,
+  mauikit-filebrowsing,
+  mauikit-imagetools,
+  qtmultimedia,
+  qtquickcontrols2,
+  qtlocation,
+  exiv2,
+  kquickimageedit,
+  fetchFromGitHub,
 }:
 
+let
+  src-kdtree = fetchFromGitHub {
+    owner = "cdalitz";
+    repo = "kdtree-cpp";
+    rev = "refs/tags/v1.3";
+    hash = "sha256-h3cmndvjMlp/MTk/Ve3R183BLrE7VbL7GQx8YkOHEgU=";
+  };
+in
 mkDerivation {
   pname = "pix";
 
@@ -26,6 +36,18 @@ mkDerivation {
     extra-cmake-modules
   ];
 
+  postPatch = ''
+    cp ${src-kdtree}/kdtree.cpp src/
+    substituteInPlace src/CMakeLists.txt \
+      --replace-fail "main.cpp" "main.cpp kdtree.cpp"
+  '';
+
+  env = {
+    NIX_CFLAGS_COMPILE = toString [
+      "-I${src-kdtree}"
+    ];
+  };
+
   buildInputs = [
     applet-window-buttons
     karchive
@@ -43,11 +65,11 @@ mkDerivation {
     kquickimageedit
   ];
 
-  meta = with lib; {
+  meta = {
     description = "Image gallery application";
     mainProgram = "pix";
     homepage = "https://invent.kde.org/maui/pix";
-    license = licenses.gpl3Plus;
-    maintainers = with maintainers; [ onny ];
+    license = lib.licenses.gpl3Plus;
+    maintainers = with lib.maintainers; [ onny ];
   };
 }