# Open sourcing rbuilder

**URL:** https://collective.flashbots.net/t/open-sourcing-rbuilder/3631
**Category:** The Flashbots Ship
**Tags:** announcement, writings, builder
**Created:** [July 3, 2024, 2:28pm UTC](https://collective.flashbots.net/t/open-sourcing-rbuilder/3631 "2024-07-03T14:28:43Z")
**Posts on this page:** 3
**Page:** 1

<div class="post-metadata">

### Author: ![jakub](https://collective.flashbots.net/letter_avatar_proxy/v4/letter/j/ecb155/32.png) [@jakub](https://collective.flashbots.net/u/jakub)
#### Post date: [July 3, 2024, 2:28pm UTC](https://collective.flashbots.net/t/open-sourcing-rbuilder/3631/1 "2024-07-03T14:28:43Z")

</div>

_This post was [originally posted](https://writings.flashbots.net/open-sourcing-rbuilder) on 2024-07-03_

We’ve open sourced rbuilder, our latest and most performant block builder written in Rust, and designed to work with Reth. You can find the full post below; please share any thoughts, questions, and comments here!

–  
An open and efficient block building ecosystem is essential to Ethereum. In order to catalyze further innovation and collaboration in block building, Flashbots has open sourced [rbuilder](https://github.com/flashbots/rbuilder), our latest and most performant block builder written in Rust, and designed to work with Reth.

We believe that sharing the responsibility and benefits of advancing block building creates a positive sum game for all Ethereum stakeholders. rbuilder is designed to be developed and stewarded by the community, and open sourcing it will accelerate this future.

We encourage developers to contribute to rbuilder, all teams to develop their builders in the open, and the community to only trust builders who follow the norms of transparency and free software.

---

<div class="post-metadata">

### Author: ![nir](https://collective.flashbots.net/letter_avatar_proxy/v4/letter/n/3bc359/32.png) [@nir](https://collective.flashbots.net/u/nir)
#### Post date: [July 4, 2024, 2:20pm UTC](https://collective.flashbots.net/t/open-sourcing-rbuilder/3631/2 "2024-07-04T14:20:32Z")

</div>

Thanks for this!

trying to build it locally but having some errors. what rust version are you using to compile this?

---

<div class="post-metadata">

### Author: ![jakub](https://collective.flashbots.net/letter_avatar_proxy/v4/letter/j/ecb155/32.png) [@jakub](https://collective.flashbots.net/u/jakub)
#### Post date: [July 4, 2024, 6:29pm UTC](https://collective.flashbots.net/t/open-sourcing-rbuilder/3631/3 "2024-07-04T18:29:35Z")

</div>

I’m on `1.79.0`. If you continue having problems you can join our [telegram rbuilder group](https://t.me/flashbots_rbuilder) and we’ll assist you.