Error installing packages: could not spawn setenv(`lld -flavor gnu`)

It doesn’t look like this has anything to do with IJulia — I suspect that the same error occurs when you try to precompile any package? (Try installing anything else, e.g. try using VersionParsing for a little package with no dependencies.)

If you google this error message, it turns up the thread julia#49718. From the sound of it, this occurs when using a broken julia installation provided with your OS distribution. The recommendation there is to install Julia via juliaup instead.

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