I built BoringSSL WITH optimizations and it took ~1m40s on a Ryzen 5600x. Maybe the OP has a slower CPU but still 5 mins is a lot.

Users shouldn't be met with compile times that long on a "Hello, world" program.

For comparison, a "Hello, world" server in Rust with Axum and Rustls takes 25s and 16s in release and debug mode respectively.