# How to build julia with existing llvm compiler

**URL:** <https://discourse.julialang.org/t/how-to-build-julia-with-existing-llvm-compiler/46319>\
**Category:** New to Julia\
**Created:** [September 9, 2020, 10:58am UTC](https://discourse.julialang.org/t/how-to-build-julia-with-existing-llvm-compiler/46319 "2020-09-09T10:58:12Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![bluefish](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/bluefish/32/17795_2.png) [@bluefish](https://discourse.julialang.org/u/bluefish)\
**Post date:** [September 9, 2020, 10:58am UTC](https://discourse.julialang.org/t/how-to-build-julia-with-existing-llvm-compiler/46319/1 "2020-09-09T10:58:13Z")

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Hi, i have latest llvm compiler (v 12.0.0) on my pc.  
how to build julia with it?

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**Author:** ![fredrikekre](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/fredrikekre/32/1688_2.png) [@fredrikekre](https://discourse.julialang.org/u/fredrikekre)\
**Post date:** [September 9, 2020, 11:09am UTC](https://discourse.julialang.org/t/how-to-build-julia-with-existing-llvm-compiler/46319/2 "2020-09-09T11:09:46Z")

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Set `USE_SYSTEM_LLVM=1` (in `Make.user` for example).

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<div class="post-metadata">

**Author:** ![bluefish](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/bluefish/32/17795_2.png) [@bluefish](https://discourse.julialang.org/u/bluefish)\
**Post date:** [September 9, 2020, 11:27am UTC](https://discourse.julialang.org/t/how-to-build-julia-with-existing-llvm-compiler/46319/3 "2020-09-09T11:27:30Z")

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> [@fredrikekre](#):
>
> `USE_SYSTEM_LLVM`

Thanks! works fine for me.  
$ vim Make.inc +35  
USE\_SYSTEM\_LLVM:=1