diff --git a/pkgs/development/arduino/platformio/chrootenv.nix b/pkgs/development/arduino/platformio/chrootenv.nix
index 8f93a0b3772..182f8fbefab 100644
--- a/pkgs/development/arduino/platformio/chrootenv.nix
+++ b/pkgs/development/arduino/platformio/chrootenv.nix
@@ -13,7 +13,7 @@ let
               inherit version;
               sha256 = "678c98275431fad324275dec63791e4a17558b40e5a110e20a82866139a85a5a";
             };
-            patches = [];
+            postPatch = "";
           });
 
           platformio = self.callPackage ./core.nix { };
diff --git a/pkgs/development/python-modules/click/default.nix b/pkgs/development/python-modules/click/default.nix
index 561c47069cb..1ae0cba4844 100644
--- a/pkgs/development/python-modules/click/default.nix
+++ b/pkgs/development/python-modules/click/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, buildPythonPackage, fetchPypi, substituteAll, locale, pytest }:
+{ lib, buildPythonPackage, fetchPypi, substituteAll, locale, pytest }:
 
 buildPythonPackage rec {
   pname = "click";
@@ -10,10 +10,10 @@ buildPythonPackage rec {
     sha256 = "5b94b49521f6456670fdb30cd82a4eca9412788a93fa6dd6df72c94d5a8ff2d7";
   };
 
-  patches = stdenv.lib.optional (stdenv.lib.versionAtLeast version "6.7") (substituteAll {
-    src = ./fix-paths.patch;
-    locale = "${locale}/bin/locale";
-  });
+  postPatch = ''
+    substituteInPlace click/_unicodefun.py \
+      --replace "'locale'" "'${locale}/bin/locale'"
+  '';
 
   buildInputs = [ pytest ];
 
@@ -24,7 +24,7 @@ buildPythonPackage rec {
   # https://github.com/pallets/click/issues/823
   doCheck = false;
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     homepage = http://click.pocoo.org/;
     description = "Create beautiful command line interfaces in Python";
     longDescription = ''
diff --git a/pkgs/development/python-modules/click/fix-paths.patch b/pkgs/development/python-modules/click/fix-paths.patch
deleted file mode 100644
index b44a08e591e..00000000000
--- a/pkgs/development/python-modules/click/fix-paths.patch
+++ /dev/null
@@ -1,13 +0,0 @@
-diff --git a/click/_unicodefun.py b/click/_unicodefun.py
-index 620edff..85a3c98 100644
---- a/click/_unicodefun.py
-+++ b/click/_unicodefun.py
-@@ -63,7 +63,7 @@ def _verify_python3_env():
-     if os.name == 'posix':
-         import subprocess
-         try:
--            rv = subprocess.Popen(['locale', '-a'], stdout=subprocess.PIPE,
-+            rv = subprocess.Popen(['@locale@', '-a'], stdout=subprocess.PIPE,
-                                   stderr=subprocess.PIPE).communicate()[0]
-         except OSError:
-             rv = b''