# `clap_mangen` > **Manpage generation for `clap`** [](https://crates.io/crates/clap_mangen) [](https://crates.io/crates/clap_mangen) [](https://github.com/clap-rs/clap/blob/clap_mangen-v0.2.24/LICENSE-APACHE) [](https://github.com/clap-rs/clap/blob/clap_mangen-v0.2.24/LICENSE-MIT) Dual-licensed under [Apache 2.0](LICENSE-APACHE) or [MIT](LICENSE-MIT). 1. [About](#about) 2. [API Reference](https://docs.rs/clap_mangen) 3. [Questions & Discussions](https://github.com/clap-rs/clap/discussions) 4. [CONTRIBUTING](https://github.com/clap-rs/clap/blob/clap_mangen-v0.2.24/clap_mangen/CONTRIBUTING.md) 5. [Sponsors](https://github.com/clap-rs/clap/blob/clap_mangen-v0.2.24/README.md#sponsors) ## About Generate [ROFF](https://en.wikipedia.org/wiki/Roff_(software)) from a `clap::Command`. ### Example We're going to assume you want to generate your man page as part of your development rather than your shipped program having a flag to generate it. Run ```console $ cargo add --build clap_mangen ``` In your `build.rs`: ```rust,no_run fn main() -> std::io::Result<()> { let out_dir = std::path::PathBuf::from(std::env::var_os("OUT_DIR").ok_or(std::io::ErrorKind::NotFound)?); let cmd = clap::Command::new("mybin") .arg(clap::arg!(-n --name )) .arg(clap::arg!(-c --count )); let man = clap_mangen::Man::new(cmd); let mut buffer: Vec = Default::default(); man.render(&mut buffer)?; std::fs::write(out_dir.join("mybin.1"), buffer)?; Ok(()) } ``` Tip: Consider a [cargo xtask](https://github.com/matklad/cargo-xtask) instead of a `build.rs` to reduce build costs.