https://mirrors.sjtug.sjtu.edu.cn/cygwin/noarch/release/mingw64-i686-libmad/
mingw64-i686-libmad
https://archlinux.org/packages/extra/x86_64/libmad/
Arch Linux - libmad 0.15.1b-10 (x86_64)
arch linux
https://mirrors.sohu.com/cygwin/x86_64/release/libmad/libmad-devel/?C=N&O=D
Index of /cygwin/x86_64/release/libmad/libmad-devel/
index ofcygwinreleasedevel
https://tracker.debian.org/pkg/libmad
libmad - Debian Package Tracker
debian packagetracker
https://lists.ibiblio.org/sympa/arc/sm-grimoire-bugs/2008-06/msg01072.html
sm-grimoire-bugs - [SM-Grimoire-Bugs] [Bug 14554] libmad-0.15.1b fails to cast - arc