# How to set the environment variable MATLAB\_ROOT when installing MATLAB.jl?
**URL:** https://discourse.julialang.org/t/how-to-set-the-environment-variable-matlab-root-when-installing-matlab-jl/73536
**Category:** General Usage
**Tags:** package
**Created:** [December 23, 2021, 4:39pm UTC](https://discourse.julialang.org/t/how-to-set-the-environment-variable-matlab-root-when-installing-matlab-jl/73536 "2021-12-23T16:39:38Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@leon](https://discourse.julialang.org/u/leon)
#### Post date: [December 23, 2021, 4:39pm UTC](https://discourse.julialang.org/t/how-to-set-the-environment-variable-matlab-root-when-installing-matlab-jl/73536/1 "2021-12-23T16:39:38Z")
My goal is to install MATLAB.jl package. The instructions say the below"
“By default, `MATLAB.jl` uses the MATLAB installation with the greatest version number. To specify that a specific MATLAB installation should be used, set the environment variable `MATLAB_ROOT` .”
Here is my question. How do I set the environmental variable “`MATLAB_ROOT`”?
My Matlab was installed at `/home/name/MATLB/R2021b/bin/`
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### Author:  [@jling](https://discourse.julialang.org/u/jling)
#### Post date: [December 23, 2021, 4:41pm UTC](https://discourse.julialang.org/t/how-to-set-the-environment-variable-matlab-root-when-installing-matlab-jl/73536/2 "2021-12-23T16:41:10Z")
an environment variable is not something you usually set within Julia, but technically you can do:
```julia
julia> ENV["MATLAB_ROOT"] = "/home/name/MATLB/R2021b/bin/"
```
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### Author:  [@leon](https://discourse.julialang.org/u/leon)
#### Post date: [December 23, 2021, 4:56pm UTC](https://discourse.julialang.org/t/how-to-set-the-environment-variable-matlab-root-when-installing-matlab-jl/73536/3 "2021-12-23T16:56:59Z")
Many thanks for the help!