gem-config: add idn-ruby, rpam2, cld3

pkgs/development/ruby-modules/gem-config/default.nix

@@ -23,7 +23,7 @@
 , cmake, libssh2, openssl, mysql, darwin, git, perl, pcre, gecode_3, curl
 , msgpack, qt59, libsodium, snappy, libossp_uuid, lxc, libpcap, xorg, gtk2, buildRubyGem
 , cairo, re2, rake, gobject-introspection, gdk_pixbuf, zeromq, czmq, graphicsmagick, libcxx
-, file, libvirt, glib, vips, taglib, libopus
+, file, libvirt, glib, vips, taglib, libopus, linux-pam, libidn, protobuf
 , libselinux ? null, libsepol ? null
 }@args:
 
@@ -79,6 +79,11 @@ in
     buildInputs = [ which icu zlib ];
   };
 
+  cld3 = attrs: {
+    nativeBuildInputs = [ pkgconfig ];
+    buildInputs = [ protobuf ];
+  };
+
   curb = attrs: {
     buildInputs = [ curl ];
   };
@@ -201,6 +206,10 @@ in
     buildFlags = lib.optional stdenv.isDarwin "--with-iconv-dir=${libiconv}";
   };
 
+  idn-ruby = attrs: {
+    buildInputs = [ libidn ];
+  };
+
   # disable bundle install as it can't install anything in addition to what is
   # specified in pkgs/applications/misc/jekyll/Gemfile anyway. Also do chmod_R
   # to compensate for read-only files in site_template in nix store.
@@ -340,6 +349,10 @@ in
     buildInputs = [ imagemagick which ];
   };
 
+  rpam2 = attrs: {
+    buildInputs = [ linux-pam ];
+  };
+
   ruby-libvirt = attrs: {
     buildInputs = [ libvirt pkgconfig ];
     buildFlags = [