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# Codex CLI on Termux — Full Summary (Unofficial Native Build)

## ✅ Overview
You successfully built and ran the real **OpenAI Codex CLI** natively on Termux.  
It logs in, executes models (e.g., `gpt-5-codex`), and runs the MCP server help.  
This is a legitimate source build — not an exploit — but **unofficial** and **unsupported** by OpenAI.

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## 🧩 Steps Performed

1. **Verified Termux environment**
   - Installed: rust 1.90, git 2.51, clang 20, make 4.4.
   - Target triple confirmed: `aarch64-linux-android`.

2. **Located Codex workspace**
   - Path: `~/codex/codex-rs/cli/Cargo.toml` (inside the main Rust monorepo).

3. **Dry-run and dependency checks**
   - `cargo check -p codex-cli -vv` succeeded.
   - Verified cross-crate dependencies resolve under Bionic libc.

4. **Initial release build attempt**
   - Terminated by Android OOM killer (expected for LTO on mobile).

5. **Rebuilt in debug mode**
   - `cargo build -p codex-cli` → successful build in ≈ 5 min.
   - Binary created: `~/codex/codex-rs/target/debug/codex` (~442 MB).

6. **Confirmed execution**