python3.pkgs.libevdev: hardcode path

pkgs/development/python-modules/libevdev/default.nix

@@ -1,4 +1,10 @@
-{ stdenv, buildPythonPackage, isPy27, fetchPypi }:
+{ stdenv
+, buildPythonPackage
+, isPy27
+, fetchPypi
+, substituteAll
+, pkgs
+}:
 
 buildPythonPackage rec {
   pname = "libevdev";
@@ -10,6 +16,13 @@ buildPythonPackage rec {
     sha256 = "17agnigmzscmdjqmrylg1lza03hwjhgxbpf4l705s6i7p7ndaqrs";
   };
 
+  patches = [
+    (substituteAll {
+      src = ./fix-paths.patch;
+      libevdev = stdenv.lib.getLib pkgs.libevdev;
+    })
+  ];
+
   doCheck = false;
 
   meta = with stdenv.lib; {

pkgs/development/python-modules/libevdev/fix-paths.patch

@@ -0,0 +1,22 @@
+diff --git a/libevdev/_clib.py b/libevdev/_clib.py
+index 6e4ab2c..9db54d1 100644
+--- a/libevdev/_clib.py
++++ b/libevdev/_clib.py
+@@ -120,7 +120,7 @@ class Libevdev(_LibraryWrapper):
+ 
+     @staticmethod
+     def _cdll():
+-        return ctypes.CDLL("libevdev.so.2", use_errno=True)
++        return ctypes.CDLL("@libevdev@/lib/libevdev.so.2", use_errno=True)
+ 
+     _api_prototypes = {
+         # const char *libevdev_event_type_get_name(unsigned int type);
+@@ -910,7 +910,7 @@ class UinputDevice(_LibraryWrapper):
+ 
+     @staticmethod
+     def _cdll():
+-        return ctypes.CDLL("libevdev.so.2", use_errno=True)
++        return ctypes.CDLL("@libevdev@/lib/libevdev.so.2", use_errno=True)
+ 
+     _api_prototypes = {
+         # int libevdev_uinput_create_from_device(const struct libevdev *, int, struct libevdev_uinput **)