./b2: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.20‘ not found (required by ./b2)./b2: /lib64/libs

        This error is usually caused by a missing required version of the C++ standard library on your system. GLIBCXX_3.4.2 and GLIBXX_3.4.21 are two specific versions of the C++ standard library. The above error will appear when compiling and running some scripts and other files.

1. Enter the following command in the terminal to check the missing GLIBCXX version:

strings /usr/lib64/libstdc++.so.6 | grep GLIBCXX

2. Find the location of the compiled gcc library file:

find / -name "libstdc++.so*"

Find a higher version library path in the output. Here I chose the 6.0.28 that comes with gcc.

3. Delete the original soft link and create a new soft link

rm -f /usr/lib64/libstdc++.so /usr/lib64/libstdc++.so.6
cd /usr/lib64
ln -s /usr/local/gcc-10.4.0/lib64/libstdc++.so.6.0.28 libstdc++.so
ln -s /usr/local/gcc-10.4.0/lib64/libstdc++.so.6.0.28 libstdc++.so.6

4. Verify whether the link is successful

ll /usr/lib64/libstdc++*

You will get the following output: