gitaly: fix x86_64-darwin build

pkgs/applications/version-management/gitlab/gitaly/default.nix

@@ -72,7 +72,7 @@ buildGoModule {
   meta = with lib; {
     homepage = "https://gitlab.com/gitlab-org/gitaly";
     description = "A Git RPC service for handling all the git calls made by GitLab";
-    platforms = platforms.linux;
+    platforms = platforms.linux ++ [ "x86_64-darwin" ];
     maintainers = with maintainers; [ roblabla globin fpletz talyz ];
     license = licenses.mit;
   };

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

@@ -26,7 +26,7 @@
 , file, libvirt, glib, vips, taglib, libopus, linux-pam, libidn, protobuf, fribidi, harfbuzz
 , bison, flex, pango, python3, patchelf, binutils, freetds, wrapGAppsHook, atk
 , bundler, libsass, libexif, libselinux, libsepol, shared-mime-info, libthai, libdatrie
-, CoreServices, DarwinTools, cctools
+, CoreServices, DarwinTools, cctools, libtool
 }@args:
 
 let
@@ -280,7 +280,7 @@ in
   };
 
   grpc = attrs: {
-    nativeBuildInputs = [ pkg-config ];
+    nativeBuildInputs = [ pkg-config ] ++ lib.optional stdenv.isDarwin libtool;
     buildInputs = [ openssl ];
     hardeningDisable = [ "format" ];
     NIX_CFLAGS_COMPILE = toString [
@@ -297,6 +297,9 @@ in
     postPatch = ''
       substituteInPlace Makefile \
         --replace '-Wno-invalid-source-encoding' ""
+    '' + lib.optionalString stdenv.isDarwin ''
+      substituteInPlace src/ruby/ext/grpc/extconf.rb \
+        --replace "ENV['AR'] = 'libtool -o' if RUBY_PLATFORM =~ /darwin/" ""
     '';
   };
 
@@ -570,7 +573,7 @@ in
   };
 
   rugged = attrs: {
-    nativeBuildInputs = [ cmake pkg-config which ];
+    nativeBuildInputs = [ cmake pkg-config which ] ++ lib.optional stdenv.isDarwin libiconv;
     buildInputs = [ openssl libssh2 zlib ];
     dontUseCmakeConfigure = true;
   };