https://ftp.gnu.org/gnu/bash/bash-5.1.tar.gz
https://ftp.gnu.org/gnu/bash/bash-5.1-patches/bash51-001
https://ftp.gnu.org/gnu/bash/bash-5.1-patches/bash51-002
https://ftp.gnu.org/gnu/bash/bash-5.1-patches/bash51-003
https://ftp.gnu.org/gnu/bash/bash-5.1-patches/bash51-004