Installing on a Mac M1

[Ani Banerjee]

I have installed Cbc on my Mac m1, via. brew, the installation location being /opt/homebrew. The stand-alone solver works fine.

Following this, I have set the following options:

export PMIP_CBC_LIBRARY="/opt/homebrew/lib/libCbcSolver.dylib"

export LD_LIBRARY_PATH="/opt/homebrew/lib/":$LD_LIBRARY_PATH

However, I still have an error when I access the MIP library -

AttributeError: function/symbol 'Osi_getIntegerTolerance' not found in library '/opt/homebrew/lib/libCbcSolver.dylib': dlsym(0x10bd38000, Osi_getIntegerTolerance): symbol not found

Any help would be appreciated, thanks!

[Feibiao Wu]

Hello!

I have encountered the same issue. Can I ask if you've solved this problem? If so, how?

[Anindya Banerjee]

I never solved it, and moved away from this library as a result.

[Túlio Toffolo]

We unfortunately do not have a Mac M1 to test at the moment.

Hopefully we'll be able to address this in the near future.

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[Penelope Aguiar]

Hi! I have the same issue.
Tried also building the cbc solver with coinbrew which produced files with .a at the end instead of .dylib.
When I tried to point to libCbcSolver.a it didn't manage to open it :/

[Tom Shlomo]

Hi, we have the same issue. Are there any plans to add M1 support? Thanks!

[Julio Villalobos]

same, any solution?

[Amitai Zernik]

+1

[Tom Shlomo]

a temp solution is to compile CBC from source:
```

mkdir CBC

cd CBC

wget https://raw.githubusercontent.com/coin-or/coinbrew/master/coinbrew

chmod u+x coinbrew 

./coinbrew fetch Cbc@master

./coinbrew build Cbc 

cp dist/lib/libCbc.0.dylib ~/.pyenv/versions/3.9.16/lib/python3.9/site-packages/mip/libraries/cbc-c-darwin-x86-64.dylib
```

replace `~/.pyenv/versions/3.9.16/lib/python3.9/site-packages/mip` with your own python-mip location.

hope that helps

[Walcelio Melo]

I tried installing CBC via conda, then Homebrew, and setting the required environment variables: but it did not work.

The only solution that worked so far is the one provided by Tom... thank you!

[Sean Kelley]

I "fixed" this issue by just having conda build the x86 version, so then you don't have to worry about building CBC yourself.

```

CONDA_SUBDIR=osx-64 conda create -n myenv python

pip install mip

```

[Tyrael Fu]

The solution provided by Tom works at 2024. Thank you!

Tom Shlomo 在 2023年4月19日 星期三下午4:32:48 [UTC+8] 的信中寫道：

[Python-MIP]

Hi,

The latest 'release candidate' version of Python-MIP (1.16RC0) includes CBC binaries for Apple ARM64 (M1/M2/M3) processors.

You can install it via pip: pip install mip==1.16rc0

[yossi amgar]

Hi,
I am definitely not an expert like you guys, 

but for me running Mac Ultra M2 on Mac OS 14.3.1, this process worked:

1. Revert to Python 3.10 (otherwise I get cffi error when I run the code)

2. Install CBC solver via conda, i.e. type in terminal: conda install coin-or-cbc
like explained in: https://github.com/coin-or/Cbc/tree/master
(so for me no need to build from source)

3. Install mip by typing in terminal: pip install mip

like explained in: https://python-mip.readthedocs.io/en/latest/install.html

4. Use the solution of "Tom Shlomo", i.e. in terminal type something like:

cp ~/dist/lib/libCbc.0.dylib ~/.pyenv/versions/.../site-packages/mip/libraries/cbc-c-darwin-x86-64.dylib

of course with appropriate adjustments, to the location of your Python environment as Tom explained.

5. Run the code and hopefully it will work