https://ftp.gnu.org/gnu/readline/readline-8.0.tar.gz
https://ftp.gnu.org/gnu/readline/readline-8.0-patches/readline80-001
https://ftp.gnu.org/gnu/readline/readline-8.0-patches/readline80-002
https://ftp.gnu.org/gnu/readline/readline-8.0-patches/readline80-003
https://ftp.gnu.org/gnu/readline/readline-8.0-patches/readline80-004