Fixed in commit b099e5e98033, forgot to close.
Ludovic Courtès writes:
> [...]
> So the root cause is that GIMP’s build process captures the output of
> ‘gcc -v’, which leads to this unintended retention.
I sent a patch to fix reference from 'gcc -v', but gcc is still here via
exiv2->gcc:
rg -a /gnu/store/069aq2v993kpc41yabp5b6vm4wb9jkhg-gc
>From ca. commit 2183db8d2ab773f41e4320367645880b06959bfc:
--8<---cut here---start->8---
$ guix size gimp | head -4
store item totalself
/gnu/store/wdm2s2si8fqsrcd5xpc29ivmpkf20s8d-mesa-21.3.8