nix-env: Fix parsing of --system

https://hydra.nixos.org/build/68827814

1 files changed, 4 insertions, 0 deletions

diff --git a/src/libmain/common-args.cc b/src/libmain/common-args.cc
index d3aac6aba..bcc05c2cd 100644
--- a/src/libmain/common-args.cc
+++ b/src/libmain/common-args.cc
@@ -37,6 +37,10 @@ MixCommonArgs::MixCommonArgs(const string & programName)
 
     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);
 }