Feng Shu transcribed 1.2K bytes:
> 
> font-google-note's size is 506.4 MB, see tooooo big as a font package,
> maybe we should split it.
> 
> #+BEGIN_EXAMPLE
> substitute: updating list of substitutes from 'https://mirror.hydra.gnu.org'... 100.0%
> The following derivations will be built:
>    /gnu/store/5j3yn3ky23dra501lv7wvlymrcgdqp9i-profile.drv
>    /gnu/store/y5xlkpcjkv161yb15f5ki18ncgj3v5lr-fonts-dir.drv
>    /gnu/store/s0r4nb37j3hnw70jifny055lkyjj5axk-gtk-icon-themes.drv
>    /gnu/store/q50q0dpycayvvamrj0ql3r6ma386r05r-xdg-desktop-database.drv
>    /gnu/store/lm0fri1ba2ickmizivm3xing1xsp7h6r-info-dir.drv
>    /gnu/store/9lvsajbnr3mri56md1fd56n6jb9qhinj-cups-filters-1.13.1.drv
>    /gnu/store/smn5bx58hynsxwxwpx0f18j6ayvlayl2-cups-2.2.1.drv
>    /gnu/store/d8jdmy8wgc5qj6zqnhxjm1d287ngcj5j-gtk+-3.22.15.drv
>    /gnu/store/czr9wqffj2h4lrv34c4s6ax8sl5l32z5-gtk-im-modules.drv
>    /gnu/store/cvin4kcl36068bhprvr30cfb2crb31l7-ca-certificate-bundle.drv
>    /gnu/store/chv3pw33jr3z3sb5lkpkpl870q6vf145-xdg-mime-database.drv
>    /gnu/store/4wnxz1mb549jfah92l1c2fn4a40f18ns-manual-database.drv
> 506.4 MB will be downloaded:
>    /gnu/store/w91pr4g1yryvdiyqwg06wbxrzwxib772-font-google-noto-20170403
> Downloading https://mirror.hydra.gnu.org/guix/nar/gzip/w91pr4g1yryvdiyqwg06wbxrzwxib772-font-google-noto-20170403...
> 
> #+END_EXAMPLE
> 
> 
> -- 
> 
> 
> 

Do you have a pattern or method in mind which won't make it too big?
This comes just from one source.
I think there's another source for noto-cjk, or at least other systems
split up the -cjk variants (I remember just Gentoo doing this).

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