Since it appeared with GLib 2.68.0, we could not change this until we bumped the dependency which has only become possible a few days ago (since Debian testing is our baseline for dependency bumps). Cf. previous commit. As this is a drop-in replacement (just a guint parameter changed to gsize to avoid integer overflow), search-and-replace with: > sed -i 's/g_memdup\>/g_memdup2/g' `grep -rIl 'g_memdup\>' *` … followed by a few manual alignment tweaks when necessary. This gets rid of the many deprecation warnings which we had lately when building with a recent GLib version.