eugene [1] filed an adoption request for fdk-aac-enc [2]: It seems it's the only aac encoder freac audio converter supports. I'll keep the package maintained, update it when needed, and fix packaging issues as they arise.
[1] https://aur.archlinux.org/account/eugene/ [2] https://aur.archlinux.org/pkgbase/fdk-aac-enc/
