I'm confused about this, as I'm getting no output packages with nix-review.

I bet the postInstall has something to do with it. Maybe remove the outputs to ensure that make actually installs things.

cc @mcmtroffaes
(they seem to be inactive for a bit, maybe mark as broken?)

If we do not get a reply in a week, we can mark it as broken.

If we do not get a reply in a week, we can mark it as broken.

Sounds fine.

$out is intended to be empty #16389 (comment)

Thanks for merging, and sorry for the delay in my response. I've tested the update just now and all looks good. For the record, no package currently depends on wolfssl, so for testing I recompiled curl against wolfssl using the following shell.nix:

with import <nixpkgs> {};
let
  curlwolfssl = (curl.override {
    openssl = wolfssl;
  }).overrideDerivation (oldAttrs: {
    configureFlags =
      # --with-ca-fallback does not work with wolfssl
      (builtins.filter (x: x != "--with-ca-fallback") oldAttrs.configureFlags)
      ++ ["--with-wolfssl=${wolfssl}" "--without-ssl"];
  });
in
{
  my-env = stdenv.mkDerivation {
    name = "my-env";
    buildInputs = [
      curlwolfssl
    ];
  };
}

I tested the resulting curl binary and compared its output against my local curl binary provided by Fedora:

curl -2 https://nixos.org
curl --cacert /etc/ssl/certs/ca-bundle.crt https://nixos.org > 1.txt
/usr/bin/curl https://nixos.org > 2.txt
diff 1.txt 2.txt

The first line gives an error message "curl: (35) wolfSSL does not support SSLv2" confirming that wolfssl is indeed used. Diff of output of local curl and this new curl shows identical outputs as expected.