# Pkg3 and standard libraries

**URL:** <https://discourse.julialang.org/t/pkg3-and-standard-libraries/9287>\
**Category:** Internals & Design\
**Created:** [February 23, 2018, 8:52pm UTC](https://discourse.julialang.org/t/pkg3-and-standard-libraries/9287 "2018-02-23T20:52:44Z")\
**Posts on this page:** 2\
**Page:** 2

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**Author:** ![Amin\_Yahyaabadi](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/amin_yahyaabadi/32/9826_2.png) [@Amin\_Yahyaabadi](https://discourse.julialang.org/u/Amin_Yahyaabadi)\
**Post date:** [August 18, 2019, 3:59am UTC](https://discourse.julialang.org/t/pkg3-and-standard-libraries/9287/21 "2019-08-18T03:59:43Z")

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Where can I find the UUID of LinearAlgebra to add it my Project.toml?

I get this warning when I use my package:

> ┌ Warning: Package MatLang does not have LinearAlgebra in its dependencies:  
> │ - If you have MatLang checked out for development and have  
> │ added LinearAlgebra as a dependency but haven’t updated your primary  
> │ environment’s manifest file, try `Pkg.resolve()`.  
> │ - Otherwise you may need to report an issue with  
> MatLang  
> └ Loading LinearAlgebra into MatLang from project dependency, future warnings for MatLang are suppressed.

Edit:  
I found it in my Manifest in my environment folder. But it is still strange that I need to add these base packages to my deps  
LinearAlgebra=“37e2e46d-f89d-539d-b4ee-838fcccc9c8e”

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<div class="post-metadata">

**Author:** ![Tamas\_Papp](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tamas_papp/32/25949_2.png) [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Post date:** [August 18, 2019, 6:44am UTC](https://discourse.julialang.org/t/pkg3-and-standard-libraries/9287/22 "2019-08-18T06:44:14Z")

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> [@Amin\_Yahyaabadi](#):
>
> But it is still strange that I need to add these base packages to my deps

Not strange at all. Packages in stdlib are like other packages, except they come bundled with Julia.

> [@Amin\_Yahyaabadi](#):
>
> Where can I find the UUID of LinearAlgebra to add it my Project.toml?

It is very unlikely that you need to look up the UUID of LinearAlgebra, just `pkg> activate` your project, then `pkg> add LinearAlgebra` should do it. See the excellent docs at

[https://julialang.github.io/Pkg.jl/dev/environments/](https://julialang.github.io/Pkg.jl/dev/environments/)

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