Python package looks for library in wrong path #5106
Description
Trying to build the python package from source without installing it will somehow try to pick the wrong path for system libraries. I get an error about being unable to import scipy.sparse, even though I can import that library in the same session (this is after successfully building lib_lightgbm through the cmake system):
>>> import scipy.sparse
>>> import lightgbm
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/david/del/py_lightgbm/python-package/lightgbm/__init__.py", line 8, in <module>
from .basic import Booster, Dataset, Sequence, register_logger
File "/home/david/del/py_lightgbm/python-package/lightgbm/basic.py", line 126, in <module>
_LIB = _load_lib()
File "/home/david/del/py_lightgbm/python-package/lightgbm/basic.py", line 117, in _load_lib
lib = ctypes.cdll.LoadLibrary(lib_path[0])
File "/home/david/anaconda3/envs/py3/lib/python3.9/ctypes/__init__.py", line 460, in LoadLibrary
return self._dlltype(name)
File "/home/david/anaconda3/envs/py3/lib/python3.9/ctypes/__init__.py", line 382, in __init__
self._handle = _dlopen(self._name, mode)
OSError: /home/david/anaconda3/envs/py3/lib/python3.9/site-packages/scipy/sparse/../../../../libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /home/david/del/py_lightgbm/lib_lightgbm.so)