## Summary
- Make `bun:ffi`'s TinyCC compiler check standard C compiler environment
variables
- Add support for `C_INCLUDE_PATH` (include paths) and `LIBRARY_PATH`
(library paths)
- Fixes compilation on NixOS and other systems that don't use standard
FHS paths
## Test plan
- [x] Added regression test `test/regression/issue/26249.test.ts` that
verifies:
- Single path in `C_INCLUDE_PATH` works
- Multiple colon-separated paths in `C_INCLUDE_PATH` work
- [x] Verified test fails with system bun (without fix)
- [x] Verified test passes with debug build (with fix)
- [x] Verified existing `cc.test.ts` tests still pass
Closes#26249🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
