It seems to break things.
@ -280,6 +280,10 @@ stdenv.mkDerivation {
hardening_unsupported_flags+=" pic"
''
+ optionalString targetPlatform.isMinGW ''
hardening_unsupported_flags+=" stackprotector"
+ ''
substituteAll ${./add-flags.sh} $out/nix-support/add-flags.sh
substituteAll ${./add-hardening.sh} $out/nix-support/add-hardening.sh