Bandwidth Test

When running bandwidth test on POWER9(RHEL7), I am getting following error-> "GLIBCXX_3.4.21’ not found ".
Any solution for this?
Thanks in advance.

[root@localhost bandwidthTest]# ./bandwidthTest
./bandwidthTest: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.21’ not found (required by ./bandwidthTest)