When a python module needs to load a dynamic shared object, it looks in the
path provided by *LD_LIBRARY_PATH*(1), but guix doesn't modify this environment
variable to export the needed path for python.
* Backtrace
In my case, it's lightgbm (installed by pip), needs libgomp.so from gcc:lib for
openmp support. Here is the backtrace:
--8<---------------cut here---------------start------------->8---
Traceback (most recent call last):
File "ex1.py", line 5, in <module>
import lightgbm as lgb
File
"/home/fis/Workspace/tianchi/medical_treatment/lib/python3.5/site-packages/lightgbm/__init__.py",
line 8, in <module>
from .basic import Booster, Dataset
File
"/home/fis/Workspace/tianchi/medical_treatment/lib/python3.5/site-packages/lightgbm/basic.py",
line 32, in <module>
_LIB = _load_lib()
File
"/home/fis/Workspace/tianchi/medical_treatment/lib/python3.5/site-packages/lightgbm/basic.py",
line 27, in _load_lib
lib = ctypes.cdll.LoadLibrary(lib_path[0])
File
"/gnu/store/jb3n0bsdpkhvyb8y70jyr8fcx8fqssr9-python-3.5.3/lib/python3.5/ctypes/__init__.py",
line 425, in LoadLibrary
return self._dlltype(name)
File
"/gnu/store/jb3n0bsdpkhvyb8y70jyr8fcx8fqssr9-python-3.5.3/lib/python3.5/ctypes/__init__.py",
line 347, in __init__
self._handle = _dlopen(self._name, mode)
OSError: libgomp.so.1: cannot open shared object file: No such file or directory
--8<---------------cut here---------------end--------------->8---
* Reproduce
To install lightgbm, simply use `pip install lightgbm`(in virtualenv).
Then in python shell:
import lightgbm as lgb
* Ad-hoc
export LD_LIBRARY_PATH=~/.guix-profile/lib:$LD_LIBRARY_PATH
[1]: https://stackoverflow.com/a/1100016
