Recipe that fails:

--8<---------------cut here---------------start------------->8---
guix remove gst-libav gst-plugins-bad gst-plugins-base gst-plugins-good gst-plugins-ugly
guix package -p foo -i gst-libav gst-plugins-bad gst-plugins-base gst-plugins-good gst-plugins-ugly epiphany
foo/bin/epiphany https://archive.org/details/guix-videos 
--8<---------------cut here---------------end--------------->8---

Recipe that works

--8<---------------cut here---------------start------------->8---
guix package -i gst-libav gst-plugins-bad gst-plugins-base gst-plugins-good gst-plugins-ugly epiphany
foo/bin/epiphany https://archive.org/details/guix-videos 
--8<---------------cut here---------------end--------------->8---

-- 
Pierre Neidhardt
https://ambrevar.xyz/