Native vendor layout (vendor/native)

The llama.cpp and standalone ggml trees used by xlai-sys-llama and xlai-sys-ggml live as git submodules under:

• vendor/native/llama.cpp
• vendor/native/ggml

After cloning, initialize them (for example):

git submodule update --init --recursive vendor/native/llama.cpp vendor/native/ggml

Override source paths (optional)

• GGML_SRC: absolute path to a ggml checkout for xlai-sys-ggml (defaults to vendor/native/ggml).
• LLAMA_CPP_SRC: absolute path to a llama.cpp checkout for xlai-sys-llama (defaults to vendor/native/llama.cpp).

Dual native stacks

Enabling both local chat (xlai-sys-llama, which bundles ggml with llama.cpp) and native QTS (xlai-sys-ggml) links two native ggml implementations into one binary. Build scripts emit a cargo:warning when xlai-facade has llama + qts, or when xlai-native enables qts. Prefer separate processes or a single stack if you hit duplicate symbols or linker issues.