diff --git a/SystemDoc.md b/SystemDoc.md
index 8811d00a..f22576da 100644
--- a/SystemDoc.md
+++ b/SystemDoc.md
@@ -31,8 +31,6 @@ System Documentation for Developers
 
 Build instructions:
 
--   (outdated) Building Qubes core and gui packages: see this [​message](https://groups.google.com/group/qubes-devel/browse_thread/thread/710f725713cc7e8a#)
-
 -   [Building all Qubes packages](/wiki/QubesBuilder)
 
 -   [KDE Dom0 packages for Qubes](/wiki/KdeDom0)