diff --git a/pkgs/development/compilers/dart/package-source-builders/pdfrx/default.nix b/pkgs/development/compilers/dart/package-source-builders/pdfrx/default.nix
index bf8d5b92a7d1..9de8f332afdd 100644
--- a/pkgs/development/compilers/dart/package-source-builders/pdfrx/default.nix
+++ b/pkgs/development/compilers/dart/package-source-builders/pdfrx/default.nix
@@ -1,25 +1,25 @@
 {
+  lib,
   stdenv,
   pdfium-binaries,
 }:
 
 { version, src, ... }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   pname = "pdfrx";
   inherit version src;
   inherit (src) passthru;
 
-  postPatch = ''
+  postPatch = lib.optionalString (lib.versionOlder version "2.2.9") ''
     substituteInPlace linux/CMakeLists.txt \
-        --replace-fail "\''${PDFIUM_DIR}/\''${PDFIUM_RELEASE}" "${pdfium-binaries}"
+      --replace-fail "\''${PDFIUM_DIR}/\''${PDFIUM_RELEASE}" "${pdfium-binaries}"
   '';
 
   installPhase = ''
     runHook preInstall
 
-    mkdir $out
-    cp -a ./* $out/
+    cp --recursive . $out
 
     runHook postInstall
   '';