ImportError : version `GLIBCXX_3.4.21' not found

[etiennekintzler]

I have the following error when I try to import the package

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-c347d14ed904> in <module>
----> 1 import ctcdecode

~/.conda/envs/test_ctcdecode/lib/python3.8/site-packages/ctcdecode/__init__.py in <module>
      1 import torch
      2 
----> 3 from ._ext import ctc_decode
      4 
      5 

ImportError: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by /path/to/home/.conda/envs/test_ctcdecode/lib/python3.8/site-packages/ctcdecode/_ext/ctc_decode.cpython-38-x86_64-linux-gnu.so)

• Indeed looking into CLIBCXX_3.4.21 is not present in /lib64/libstdc++.so.6. However it is present in the path .conda/envs/test_ctcdecode/lib/libstdc++.so.6.0.29
• The error is still occur when I am not inside a conda environment.
• I try installing libgcc from conda as recommended in BVLC/caffe#4953 but it has not worked.
• when I import the library pyarrow beforehand I am able to import the package.
• I am on centos7 and I installed the package as instructed in the README.md

[etiennekintzler]

ok my bad, setting the env variable LD_LIBRARY_PATH does solve the issue.

The problem is that I set it to the library file path instead of the directory path, i.e set it to /path/to/conda_env/envs/test_ctcdecode/lib/libstdc++.so.6 instead of /path/to/conda_env/envs/test_ctcdecode/lib/