Build will start failing with the following error in 2.55.1 due to `/build/librsvg-2.55.1/.libs` ending up in rpath:
RPATH of binary /nix/store/78k70limslvxs6y98hdirbcixl3car1q-librsvg-2.55.1-installedTests/libexec/installed-tests/RSVG/api contains a forbidden reference to /build/