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-rw-r--r--pkgs/stdenv/custom/default.nix2
1 files changed, 2 insertions, 0 deletions
diff --git a/pkgs/stdenv/custom/default.nix b/pkgs/stdenv/custom/default.nix
index 174b8593c0aa..188d00277731 100644
--- a/pkgs/stdenv/custom/default.nix
+++ b/pkgs/stdenv/custom/default.nix
@@ -2,6 +2,8 @@
 , system, platform, crossSystem, config
 }:
 
+assert crossSystem == null;
+
 rec {
   vanillaStdenv = import ../. {
     inherit lib allPackages system platform crossSystem;