# How does BinaryBuilder work?

**URL:** <https://discourse.julialang.org/t/how-does-binarybuilder-work/139411>\
**Category:** New to Julia\
**Created:** [September 12, 2026, 5:42pm UTC](https://discourse.julialang.org/t/how-does-binarybuilder-work/139411 "2026-09-12T17:42:59Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![obsidianjulua](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/obsidianjulua/32/221495_2.png) [@obsidianjulua](https://discourse.julialang.org/u/obsidianjulua)\
**Post date:** [September 12, 2026, 5:42pm UTC](https://discourse.julialang.org/t/how-does-binarybuilder-work/139411/1 "2026-09-12T17:42:59Z")

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Can BinaryBuilder.jl deploy its toolchain building and vm locally and Id like to test building and deploying a jll locally and test vendoring it across another platform but im not sure if I need to CI push a deploy/recipe to BinaryBuilder or how that works? If I install the entire stack whats the limit of local deployment and testing with vm toolchains that I can do? if I deploy a vm to run the binarys can BinaryBuilder vm the toolchain building with a set of rules and provide seperate or a single deployable cross platform artifact?

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**Author:** ![obsidianjulua](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/obsidianjulua/32/221495_2.png) [@obsidianjulua](https://discourse.julialang.org/u/obsidianjulua)\
**Post date:** [September 13, 2026, 10:17am UTC](https://discourse.julialang.org/t/how-does-binarybuilder-work/139411/2 "2026-09-13T10:17:22Z")

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Ohh, BinaryBuilder sandboxes locally. This is easier than my original assumptions.

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**Author:** ![giordano](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/giordano/32/2166_2.png) [@giordano](https://discourse.julialang.org/u/giordano)\
**Post date:** [September 13, 2026, 10:23am UTC](https://discourse.julialang.org/t/how-does-binarybuilder-work/139411/3 "2026-09-13T10:23:43Z")

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When everything else fails, [reading the documentation sometimes helps](https://docs.binarybuilder.org/stable/FAQ/#Can-I-publish-a-JLL-package-locally-without-going-through-Yggdrasil?-1). [Also](https://docs.binarybuilder.org/stable/reference/#Command-Line)

> ```plaintext
> --deploy=<repo> Deploy binaries and JLL wrapper code to a github
> release of an autogenerated repository. Uses
> `github.com/JuliaBinaryWrappers/<name>_jll.jl` by
> default, unless `<repo>` is set, in which case it
> should be set as `<owner>/<name>_jll.jl`. Setting
> this option is equivalent to setting `--deploy-bin`
> and `--deploy-jll`. If `<repo>` is set to "local"
> then nothing will be uploaded, but JLL packages
> will still be written out to `~/.julia/dev/`.
> 
> ```

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**Author:** ![obsidianjulua](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/obsidianjulua/32/221495_2.png) [@obsidianjulua](https://discourse.julialang.org/u/obsidianjulua)\
**Post date:** [September 13, 2026, 10:27am UTC](https://discourse.julialang.org/t/how-does-binarybuilder-work/139411/4 "2026-09-13T10:27:32Z")

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I did, the first question was pre-docs curiosity 😅