Hi @enotikalt,

gifsave relies on the cgif library, so you need to build libvips against that:

https://github.com/dloebl/cgif

brew does this, but the standard ubuntu package does not. You'll need to build libvips yourself if you need this feature.

You can use write_to_file instead: this will examine the filename suffix and pick the best saver it can find. Without cgif, this will fall back to the slower and more memory hungry imagemagick.