libfftw3 not defined on Raspberry Pi 3 Raspbian

[amckay1]

Hi, I'm using Julia 1.3.1 32-bit generic binary on an Arm-based Raspberry Pi and was trying to install Images.jl but kept running into a "libfftw3 not defined" error that I traced to FFTW.jl (v1.2.0). I've installed 'libfftw3-dev' and I think I can get the library to load using Libdl, but realized that is likely not the problem since it is simply not defined in the 'src/FFTW.jl' file somehow? Looking at 'src/FFTW.jl' (and following the error message) I realized line 27 does not make it clear where libfftw3 is coming from, so I'm guessing one of packages used should be pulling it in but isn't.

Thanks for any help you can provide and I understand that since this is an Arm architecture the answer might be "that just doesn't work right now" :)

[giordano]

What version of FFTW.jl are you using?

[amckay1]

v1.2.0. Thanks!

[giordano]

Can you please try to do

using Pkg
Pkg.add(PackageSpec(name="FFTW_jll", rev="704f8580a0c9395721016c85a9ea376e272074fe"))

and see if now FFTW.jl works for you?

[amckay1]

Thanks for the suggestion, unfortunately it doesn't seem to work. I now have FFTW_jll v3.3.9+4 #704f858 but running using FFTW results in the same error, same for when I remove and add FFTW.jl back or build it again.

[giordano]

That's because I told you the wrong revision 🤦‍♀️ Try this:

using Pkg
Pkg.add(PackageSpec(name="FFTW_jll", rev="633945700554833c7ecc7140bf2e76c4e37cc8e5"))

[amckay1]

Haha, second times a charm, I think that one did the trick! I had to restart Julia but now I can load FFTW.jl and Images.jl as well! Thank you so much!