This is to differentiate the library other packages such as fdkaac-git. fdk-aac [1] into libfdk-aac [2] [1] https://aur.archlinux.org/packages/fdk-aac/ [2] https://aur.archlinux.org/packages/libfdk-aac/
fdk-aac-git [3] into libfdk-aac-git [4] [3] https://aur.archlinux.org/packages/fdk-aac-git/ [4] https://aur.archlinux.org/packages/libfdk-aac-git/ Thanks.
