There's a merged pull request on the void-packages repository

gimp: put locale data in /usr/share/locale.
https://github.com/void-linux/void-packages/pull/27511

Description:
Their gettext version check tries to link _nl_msg_cat_cntr, which is
available only in GNU gettext. This breaks when using musl's built-in
gettext impl, and leads to DATADIRNAME=lib being set, which is then used
to set gimplocaledir to /usr/lib/locale.