# Several packages won't precompile after update

**URL:** <https://discourse.julialang.org/t/several-packages-wont-precompile-after-update/46580>\
**Category:** General Usage\
**Created:** [September 14, 2020, 10:06am UTC](https://discourse.julialang.org/t/several-packages-wont-precompile-after-update/46580 "2020-09-14T10:06:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Igor\_Douven](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/igor_douven/32/8433_2.png) [@Igor\_Douven](https://discourse.julialang.org/u/Igor_Douven)\
**Post date:** [September 14, 2020, 10:06am UTC](https://discourse.julialang.org/t/several-packages-wont-precompile-after-update/46580/1 "2020-09-14T10:06:12Z")

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Hi all,

After I updated all packages this morning, several packages (e.g., Gadfly, Optim, KernelDensity) refuse to pre-compile, all giving the following error:

```julia
LoadError: UndefVarError: @printf not defined

```

I deleted the `.julia` folder, installed the packages afresh, but I’m running into the same problem. Btw, `@printf` works fine (after running `using Printf`). Does anyone have an idea what happened?

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<div class="post-metadata">

**Author:** ![Igor\_Douven](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/igor_douven/32/8433_2.png) [@Igor\_Douven](https://discourse.julialang.org/u/Igor_Douven)\
**Post date:** [September 14, 2020, 12:44pm UTC](https://discourse.julialang.org/t/several-packages-wont-precompile-after-update/46580/2 "2020-09-14T12:44:23Z")

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I had Julia installed from the Arch repositories. I removed that and re-installed from the Julia website, which solved the problem.