When compiling my library, I get: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.20' not found when running executables. Adding LD_LIBRARY_PATH=/usr/local/lib64 fixes the issue. Should this variable be added to the image or the path added to /etc/ld.so.conf.d/ ?