Description
openedon Jul 15, 2020
What language and solver does this apply to?
Python
Describe the problem you are trying to solve.
I would like to be able to easily install ortools on FreeBSD using pip.
Describe the solution you'd like
I would like to be able to write pip install ortools on FreeBSD and have ortools be installed.
Currently, running pip install ortools produces the following output on FreeBSD 12.1 STABLE:
Collecting ortools
ERROR: Could not find a version that satisfies the requirement ortools (from versions: none)
ERROR: No matching distribution found for ortools
Describe alternatives you've considered
Approach 1:
I've tried installing the py3-ortools Python package via pip install py3-ortools.
However, running:
python3.7
from ortools.linear_solver import pywraplp
Produces error:
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/ortools/linear_solver/pywraplp.py", line 18, in swig_import_helper
return importlib.import_module(mname)
File "/usr/local/lib/python3.7/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 670, in _load_unlocked
File "<frozen importlib._bootstrap>", line 583, in module_from_spec
File "<frozen importlib._bootstrap_external>", line 1043, in create_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
ImportError: Shared object "libc.so.6" not found, required by "_pywraplp.so"
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.7/site-packages/ortools/linear_solver/pywraplp.py", line 21, in <module>
_pywraplp = swig_import_helper()
File "/usr/local/lib/python3.7/site-packages/ortools/linear_solver/pywraplp.py", line 20, in swig_import_helper
return importlib.import_module('_pywraplp')
File "/usr/local/lib/python3.7/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
ModuleNotFoundError: No module named '_pywraplp'
Approach 2:
I've tried to build the library from source on FreeBSD (which required the installation of cmake and gcc, the latter to avoid build errors related to dependencies).
The procedure was (in a Vagrant FreeBSD image):
pkg install python37 py37-pip gcc cmake swig git
git clone https://github.com/google/or-tools
cd or-tools
CC=/usr/local/bin/gcc CXX=/usr/local/bin/g++ cmake -DBUILD_DEPS=ON -DBUILD_PYTHON=ON .
The build succeeds.
Unfortunately, the following does not work for some reason (perhaps there are build steps that I am missing):
cd python/Release
pip install .
python3.7
import ortools
Which produces the following error:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'ortools'
Ideally one could just write pip install ortools and avoid the above entirely, just like on all the other major operating systems.
