You need an updated libstdc++.so. See LINUX_INSTALL.md for details.
I get an error "ImportError .. version GLIBCXX\_3.4.21 not defined in libstdc++.so.6 with link time reference"
You need an updated libstdc++.so. See LINUX_INSTALL.md for details. (Strictly, speaking you have an updated libstdc++.so, but it was not compiled with the cxx11 abi)
I get an error "ImportError: libblas.so.3: Cannot open shared object file: No such file or directory"
You need to install Blas and Lapack. See LINUX_INSTALL.md for details.
I get an error "ImportError: liblapack.so.3: Cannot open shared object file: No such file or directory"
You need to install Blas and Lapack. See LINUX_INSTALL.md for details.