Download

Get a local AthenaK checkout with required submodules (especially Kokkos).

Developer clone with token authentication

If your workflow requires authenticated HTTPS operations from the start:

git clone --recursive https://USERNAME:TOKEN@github.com/IAS-Astrophysics/athenak.git
cd athenak

Replace TOKEN with a GitHub personal access token scoped appropriately for your repository access.

If you already cloned without submodules

Initialize and update submodules (including Kokkos):

git submodule init
git submodule update

Verification

Confirm the Kokkos submodule exists:

ls kokkos

Next step

Continue with Build.