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# Build Guide
This is for those who want to build `rathole` themselves, possibly because the need of latest features or the minimal binary size.
## Build
To use default build settings, run:
```sh
cargo build --release
```
You may need to pre-install [openssl](https://docs.rs/openssl/latest/openssl/index.html) dependencies in Unix-like systems.
## Customize the Build
`rathole` comes with lots of *crate features* that determine whether a certain feature will be compiled or not. Supported features can be checked out in `[features]` of [Cargo.toml](../Cargo.toml).
For example, to build `rathole` with the `client` and `noise` feature:
```sh
cargo build --release --no-default-features --features client,noise
```
## Rustls Support
`rathole` provides optional `rustls` support. It's an almost drop-in replacement of `native-tls` support. (See [Transport](transport.md) for more information.)
To enable this, disable the default features and enable `rustls` feature. And for websocket feature, enable `websocket-rustls` feature as well.
You can also use command line option for this. For example, to replace all default features with `rustls`:
```sh
cargo build --release --no-default-features --features server,client,rustls,noise,websocket-rustls,hot-reload
```
Feature `rustls` and `websocket-rustls` cannot be enabled with `native-tls` and `websocket-native-tls` at the same time, as they are mutually exclusive. Enabling both will result in a compile error.
(Note that default features contains `native-tls` and `websocket-native-tls`.)
## Minimalize the binary
1. Build with the `minimal` profile
The `release` build profile optimize for the program running time, not the binary size.
However, the `minimal` profile enables lots of optimization for the binary size to produce a much smaller binary.
For example, to build `rathole` with `client` feature with the `minimal` profile:
```sh
cargo build --profile minimal --no-default-features --features client
```
2. `strip` and `upx`
The binary that step 1 produces can be even smaller, by using `strip` and `upx` to remove the symbols and compress the binary.
Like:
```sh
strip rathole
upx --best --lzma rathole
```
At the time of writting the build guide, the produced binary for `x86_64-unknown-linux-glibc` has the size of **574 KiB**, while `frpc` has the size of **~10 MiB**, which is much larger.
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