Error building FFTW on Windows

General Usage
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Any idea:

ERROR: LoadError: Unable to open libLLVM!
...
 in expression starting at C:\Users\runneradmin\.julia\packages\FFTW\oepdx\deps\build_fftw.jl:1
in expression starting at C:\Users\runneradmin\.julia\packages\FFTW\oepdx\deps\build.jl:20
ERROR: LoadError: Error building `FFTW`:

This happens only on Windows, and it worked last week.

What could be the reason?

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3 Likes
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@ufechner7 instead of adding FFTW which you don’t directly use, why don’t you upgrade DSP.jl to v0.8 in

which would automatically require a much newer FFTW for you

?

On an unrelated (?) note, you may want to reactivate CompatHelper in your repositories

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Because my code does not work with DSP 0.8.

My software depends on about 500 packages. If I would always upgrade all dependencies to the newest (braking) version I would not have much time left to do anything else.

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I added:

[deps]
FFTW = "7a1cc6ca-52ef-59f5-83cd-3a7055c09341"
[compat]
FFTW = "1.8.0"

to Project.toml, and now it works.

Thank you!

1 Like
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I think the true fix would be merging allow MKL_jll version 2025 by ranocha · Pull Request #314 · JuliaMath/FFTW.jl · GitHub and registering a new version of FFTW.jl including this fix.

3 Likes
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With allow MKL_jll version 2025 by ranocha · Pull Request #314 · JuliaMath/FFTW.jl · GitHub being merged and FFTW.jl v1.8.1 being released, you should be able to remove the dependency of FFTW.jl in your package again, @ufechner7.

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Thank you!