htmldoc: fix darwin build (#178725)

Co-authored-by: Sandro <[e-mail]>

pkgs/tools/typesetting/htmldoc/default.nix

···
-{ lib, stdenv, fetchFromGitHub, zlib, libpng, libjpeg, SystemConfiguration, Foundation, pkg-config }:
+{ lib, stdenv, testers, fetchFromGitHub, zlib, libpng, libjpeg, SystemConfiguration, Foundation, pkg-config, htmldoc }:
 
 stdenv.mkDerivation rec {
   pname = "htmldoc";
···
   buildInputs = [ zlib libpng libjpeg ]
     ++ lib.optionals stdenv.isDarwin [ Foundation SystemConfiguration ];
 
+  # do not generate universal binary on Darwin
+  # because it is not supported by Nix's clang
+  postPatch = ''
+    substituteInPlace configure --replace "-arch x86_64 -arch arm64" ""
+  '';
+
+  passthru.tests = testers.testVersion {
+    package = htmldoc;
+    command = "htmldoc --version";
+  };
+
   meta = with lib; {
-    broken = stdenv.isDarwin;
     description = "Converts HTML files to PostScript and PDF";
     homepage    = "https://michaelrsweet.github.io/htmldoc";
     changelog   = "https://github.com/michaelrsweet/htmldoc/releases/tag/v${version}";