mingw64-icecast from multimedia:xiph:beta project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/multimedia:xiph:beta/openSUSE_Tumbleweed/multimedia:xiph:beta.repo zypper refresh zypper install mingw64-icecast