python3Packages.cbor2: add option to build without C extensions

pkgs/development/python-modules/cbor2/default.nix

@@ -4,6 +4,8 @@
   fetchPypi,
   pythonOlder,
 
+  withCExtensions ? true,
+
   # build-system
   setuptools,
   setuptools-scm,
@@ -39,6 +41,14 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
+  env = lib.optionalAttrs (!withCExtensions) {
+    CBOR2_BUILD_C_EXTENSION = "0";
+  };
+
+  passthru = {
+    inherit withCExtensions;
+  };
+
   meta = with lib; {
     changelog = "https://github.com/agronholm/cbor2/releases/tag/${version}";
     description = "Python CBOR (de)serializer with extensive tag support";

pkgs/top-level/python-packages.nix

@@ -2282,6 +2282,10 @@ self: super: with self; {
 
   cbor2 = callPackage ../development/python-modules/cbor2 { };
 
+  cbor2WithoutCExtensions = callPackage ../development/python-modules/cbor2 {
+    withCExtensions = false;
+  };
+
   cccolutils = callPackage ../development/python-modules/cccolutils { krb5-c = pkgs.krb5; };
 
   cdcs = callPackage ../development/python-modules/cdcs { };