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+---
+pr_number: 5455
+title: "fix: require executable gcc path in Docker harness"
+author: "AceHack"
+state: "MERGED"
+created_at: "2026-05-27T13:43:50Z"
+merged_at: "2026-05-27T13:47:27Z"
+closed_at: "2026-05-27T13:47:28Z"
+head_ref: "claim/codex-docker-cc-path-executable-check-20260527"
+base_ref: "main"
+archived_at: "2026-05-27T17:56:25Z"
+archive_tool: "tools/pr-preservation/archive-pr.ts"
+---
+
+# PR #5455: fix: require executable gcc path in Docker harness
+
+## PR description
+
+## Summary
+- tighten the Docker NixOS install-sh harness gcc path guard from non-empty to executable
+- keep the existing command -v lookup while failing earlier if PATH resolves a non-executable gcc path
+
+## Checks
+- git diff --check origin/main...HEAD
+- codex loop health: ok, no lock before push
+
+Co-Authored-By: Codex <noreply@openai.com>
+
+## Reviews
+
+### COMMENTED — @copilot-pull-request-reviewer (2026-05-27T13:45:10Z)
+
+## Pull request overview
+
+This PR tightens the NixOS Docker install harness so the `gcc` path used to create `/usr/local/bin/cc` must resolve to an executable, preventing a broken compiler shim from being created.
+
+**Changes:**
+- Replaces the non-empty `gcc` path check with an executable check.
+- Keeps the existing `command -v gcc` lookup and symlink behavior unchanged.
+
+## General comments
+
+### @chatgpt-codex-connector (2026-05-27T13:43:56Z)
+
+You have reached your Codex usage limits for code reviews. You can see your limits in the [Codex usage dashboard](https://chatgpt.com/codex/cloud/settings/usage).