gnome.gnome-keyring: support cross compilation

pkgs/desktops/gnome/core/gnome-keyring/default.nix

@@ -63,6 +63,9 @@ stdenv.mkDerivation rec {
     # gnome-keyring doesn't build with ssh-agent by default anymore, we need to
     # switch to using gcr https://github.com/NixOS/nixpkgs/issues/140824
     "--enable-ssh-agent"
+    "LIBGCRYPT_CONFIG=${lib.getExe' (lib.getDev libgcrypt) "libgcrypt-config"}"
+    "SSH_ADD=${lib.getExe' openssh "ssh-add"}"
+    "SSH_AGENT=${lib.getExe' openssh "ssh-agent"}"
   ];
 
   # Tends to fail non-deterministically.
@@ -72,6 +75,7 @@ stdenv.mkDerivation rec {
 
   postPatch = ''
     patchShebangs build
+    addToSearchPath ACLOCAL_PATH ${lib.getDev libgcrypt}/share/aclocal
   '';
 
   checkPhase = ''