openGauss 5.0安装后yum不可用解决方法

每次装完openGauss之后总是会有这个问题（6.0已经修复），于是写下来记录一下以便以后自己查阅
报错如下：

Traceback (most recent call last):
  File "/usr/bin/yum", line 57, in <module>
    from dnf.cli import main
  File "/usr/lib/python3.9/site-packages/dnf/__init__.py", line 30, in <module>
    import dnf.base
  File "/usr/lib/python3.9/site-packages/dnf/base.py", line 29, in <module>
    import libdnf.transaction
  File "/usr/lib64/python3.9/site-packages/libdnf/__init__.py", line 8, in <module>
    from . import error
  File "/usr/lib64/python3.9/site-packages/libdnf/error.py", line 13, in <module>
    from . import _error
ImportError: /opt/software/om/script/gspylib/clib/libstdc++.so.6: version `GLIBCXX_3.4.26' not found (required by /usr/lib64/libdnf.so.2)

导致yum不可用的原因是在/etc/profile里面加的两项环境变量有问题，注释重启即可。