python3Packages.httpsig: fix build

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

@@ -1,9 +1,10 @@
 { lib
 , buildPythonPackage
 , fetchPypi
-, setuptools_scm
+, setuptools-scm
 , pycryptodome
 , requests
+, six
 }:
 
 buildPythonPackage rec {
@@ -15,13 +16,17 @@ buildPythonPackage rec {
     sha256 = "1rkc3zwsq53rjsmc47335m4viljiwdbmw3y2zry4z70j8q1dbmki";
   };
 
-  buildInputs = [ setuptools_scm ];
-  propagatedBuildInputs = [ pycryptodome requests ];
+  buildInputs = [
+    setuptools-scm
+  ];
 
-  # Jailbreak pycryptodome
-  preBuild = ''
-    substituteInPlace setup.py --replace "==3.4.7" ""
-  '';
+  propagatedBuildInputs = [
+    pycryptodome
+    requests
+    six
+  ];
+
+  pythonImportsCheck = [ "httpsig" ];
 
   meta = with lib; {
     description = "Sign HTTP requests with secure signatures";