The latest nixos-20.09 channel does not have firefox prebuilt. Does anyone know why?
$ git checkout nixos-20.09
$ git pull
$ git rev-parse HEAD
aa5b9cd16b91d8a24681c3888951d7c3dc612314
$ nix-build -A firefox
these derivations will be built:
/nix/store/bwkpqjb8fxsacqx8v9nhzfv10b2bdh8s-firefox-unwrapped-84.0.1.drv
/nix/store/7lhrdy3n4qdx000mc8mb2risvbzs310l-firefox-84.0.1.drv
The channel had firefox binaries just a few days ago:
$ git checkout nixos-20.09~50
$ nix-build -A firefox
these derivations will be built:
/nix/store/kqn2af0rj5zk28bir2jfz223l7spqbm3-firefox-84.0.drv
these paths will be fetched (49.70 MiB download, 183.82 MiB unpacked):
/nix/store/mjkhd8b13rfc3zvrzpq1c1y1bbga0g4l-firefox-unwrapped-84.0
copying path '/nix/store/mjkhd8b13rfc3zvrzpq1c1y1bbga0g4l-firefox-unwrapped-84.0' from 'https://cache.nixos.org'...
building '/nix/store/kqn2af0rj5zk28bir2jfz223l7spqbm3-firefox-84.0.drv'...
/nix/store/smqlqhm4bf3fny17zgmslvbmwsbbl7m7-firefox-84.0