{gpclient,gpauth}: add darwin support (#452228)

pkgs/by-name/gp/gpauth/package.nix

@@ -6,6 +6,7 @@
   pkg-config,
   perl,
   webkitgtk_4_1,
+  stdenv,
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -29,10 +30,12 @@ rustPlatform.buildRustPackage rec {
   ];
   buildInputs = [
     openssl
+  ]
+  ++ lib.optionals stdenv.hostPlatform.isLinux [
     webkitgtk_4_1
   ];
 
-  meta = with lib; {
+  meta = {
     changelog = "https://github.com/${src.owner}/${src.repo}/blob/${src.rev}/changelog.md";
     description = "CLI for GlobalProtect VPN, based on OpenConnect, supports the SSO authentication method";
     longDescription = ''
@@ -43,14 +46,11 @@ rustPlatform.buildRustPackage rec {
       the same features as the GUI version.
     '';
     homepage = "https://github.com/${src.owner}/${src.repo}";
-    license = with licenses; [ gpl3Only ];
-    maintainers = with maintainers; [
+    license = lib.licenses.gpl3Only;
+    maintainers = with lib.maintainers; [
       binary-eater
       m1dugh
     ];
-    platforms = [
-      "aarch64-linux"
-      "x86_64-linux"
-    ];
+    platforms = with lib.platforms; linux ++ darwin;
   };
 }