diff --git a/src/python/jw/pkg/App.py b/src/python/jw/pkg/App.py
index f58698fc..6daeaa74 100644
--- a/src/python/jw/pkg/App.py
+++ b/src/python/jw/pkg/App.py
@@ -12,7 +12,7 @@ if TYPE_CHECKING:
     import os, sys, pwd, re
 
 import os, sys, argparse, pwd, re
-from functools import lru_cache
+from functools import lru_cache, cached_property
 from enum import Enum, auto
 
 from .lib.App import App as Base
@@ -374,6 +374,14 @@ class App(Base):
     def distro_cascade(self) -> str:
         return ' '.join(self.os_cascade())
 
+    @cached_property
+    def distro_pkg_ext(self) -> str:
+        for entry in self.os_cascade():
+            ret = entry.replace('pkg-', '')
+            if ret != entry:
+                return ret
+        raise RuntimeError(f'No package extension in found in {self.distro_cascade}')
+
     @property
     def distro_gnu_triplet(self) -> str: