Libwebkitgtk-3 is missing

After updating from Linux Mint 19.3 to 21.1 my compiled apps now complain that libwebgtk-3 is missing: the fun fact is that before upgrading everything was just fine.
Now I see that libwebgtk-3 is missing from the official repositories: how can I make my program work again without the hassle of recompiling?
Is there a way to install just the library needed?
Many thanks.