gif2webp: https://storage.googleapis.com/downloads.webmproject.org/releases/webp/index.html

linux_x86_64  libwebp-1.2.1-linux-x86-64.tar.gz
linux_aarch64
windows_amd64 libwebp-1.2.1-windows-x64.zip
darwin_x86_64 libwebp-1.2.1-mac-10.15.tar.gz
darwin_arm64

rlottie + lottie2gif: https://github.com/Samsung/rlottie/tree/327fb7dbaad225555d5ca567b9adee9ce5f879f4

Built per instructions in build_steps.txt

linux_x86_64  ✔
linux_aarch64 :x:
windows_amd64 ✔
darwin_x86_64 :x:
darwin_arm64  :x:
