Availability of Icecast package for Raspberry Pi ?

[Dave]

I run Arch Linux on a Raspberry Pi 4b with 4Gb and I would like to 
install "icecast" and possibly "darkice" but "pacman" reports "not found".

Is it not available for this platform ??   If so is there an 
alternative??  Or am I missing something obvious ?

Regards,
Dave