`apt search libgtk` on Linux Mint 21.2 doesn't show it. Only versions 2, 3 and 4. Searching https://pkgs.org https://pkgs.org says that most distros don't have

`apt search libgtk` on Linux Mint 21.2 doesn't show it. Only versions 2, 3 and 4. Searching https://pkgs.org https://pkgs.org says that most distros don't have a gtk 1 package... except for Slackware!