How to compile a specific version of julia?

@anibal 

To compile a specific version of Julia, you need to:

1. Download the source code for the desired version from the official Julia repository at https://github.com/JuliaLang/julia.
2. Checkout the branch or tag corresponding to the desired version. For example, to compile version 1.6.0, run:

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$ git clone https://github.com/JuliaLang/julia.git
$ cd julia
$ git checkout v1.6.0

1. Build and install Julia. On most systems, you can use the following commands:

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$ make
$ make install

Note that you may need to have some dependencies installed before you can compile and install Julia, such as a recent version of GCC, make, and other development tools.

It's also possible to use a package manager like Homebrew on macOS to install a specific version of Julia:

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$ brew install julia@1.6

This will install the latest available version 1.6.x of Julia.