python3Packages.netaddr: fix static build (#441076)

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

@@ -1,8 +1,8 @@
 {
   lib,
+  stdenv,
   buildPythonPackage,
   fetchPypi,
-  pythonOlder,
   setuptools,
   pytestCheckHook,
 }:
@@ -12,14 +12,24 @@ buildPythonPackage rec {
   version = "1.3.0";
   pyproject = true;
 
-  disabled = pythonOlder "3.7";
-
   src = fetchPypi {
     inherit pname version;
     hash = "sha256-XDw9mJW1Ubdjd5un23oDSH3B+OOzha+BmvNBrp725Io=";
   };
 
-  nativeBuildInputs = [ setuptools ];
+  # Test suite uses internal packaging._musllinux module to detect libc flavor. The module assumes
+  # the python executable is dynamically linked - it then attempts to parse linked library name to
+  # detect musl. It won't work on a static build.
+  postPatch =
+    if (stdenv.targetPlatform.isMusl && stdenv.targetPlatform.isStatic) then
+      ''
+        substituteInPlace netaddr/tests/__init__.py \
+          --replace-fail "IS_MUSL = _get_musl_version(sys.executable) is not None" "IS_MUSL = True"
+      ''
+    else
+      null;
+
+  build-system = [ setuptools ];
 
   nativeCheckInputs = [ pytestCheckHook ];