1 files changed, 8 insertions, 0 deletions
diff --git a/src/libmain/common-args.cc b/src/libmain/common-args.cc
index ea27aaa35e03..bcc05c2cdad6 100644
--- a/src/libmain/common-args.cc
+++ b/src/libmain/common-args.cc
@@ -34,6 +34,14 @@ MixCommonArgs::MixCommonArgs(const string & programName)
                 warn(e.what());
             }
         });
+
+    std::string cat = "config";
+    settings.convertToArgs(*this, cat);
+
+    // Backward compatibility hack: nix-env already had a --system flag.
+    if (programName == "nix-env") longFlags.erase("system");
+
+    hiddenCategories.insert(cat);
 }
 
 }