Unable to run on up-to-date Mac

[grahamas]

On up-to-date OSX it doesn't seem possible to run pymagicc--- is this correct?

The problem is that 32-bit applications (including wine) are no longer supported (see: https://superuser.com/questions/1513877/bad-cpu-type-in-executable-wine-macos-catalina).

If this is the case, could you update the README to make this apparent up front? Otherwise, are there any workarounds?

[rgieseke]

Does it work with the MAGICC7 binary available here? https://magicc.org/download/magicc7

See further down in the README on how to use a different binary.

[grahamas]

That does seem to be the correct workaround. We weren't able to get it to work, though for seemingly unrelated reasons (libgfortran wasn't linked properly and we gave up). I would request updating the README for Macs since using the provided binary will be necessary for all Macs going forward.

[Aq0amancer]

Having the same issue, both libgfortran is not linked and struggling with setting the environment variable to use 'magicc-darwin-arm64' in MAGICC7. An updated readme would be really helpful, thank you!

[seangtkelley]

@Aq0amancer and @grahamas, not sure if you're still experiencing the issue with libgfortran, but there's the steps I recently took to get it to work on macOS Sequoia:

# ensure gcc is installed as that provides libgfortran
brew install gcc

# find path to libgfortran.5.dylib
find /opt/homebrew -name "libgfortran*.dylib"

# use environment variable to specify the path to libgfortran
# in my case, my path looked like the following
export DYLD_LIBRARY_PATH=/opt/homebrew/Cellar/gcc/14.2.0_1/lib/gcc/current:$DYLD_LIBRARY_PATH

# now you should be able to use the magicc7 executable
./magicc-darwin-arm64

For using pymagicc, you'll also need the MAGICC_EXECUTABLE_7 env var as mentioned at the bottom of the README. I have the following cell in my python notebook before using pymagicc:

%env DYLD_LIBRARY_PATH=/opt/homebrew/Cellar/gcc/14.2.0_1/lib/gcc/current:$DYLD_LIBRARY_PATH
%env MAGICC_EXECUTABLE_7=/path/to/magicc/magicc-v7.5.3/bin/magicc-darwin-arm64