I'm trying to use a make file for xnee, and everything was going smooth for its install until the end when the mentioned error occurred.
This question said to try either to install libgtk2.0-dev or libgtk-3-dev, but neither of them resolved the issue.
Is there a newer GTK version that I should be using? The version of xnee I'm trying to use is 3.19, released in 2014-- those GTK versions should be perfectly fine.
I'm running Ubuntu 18.04 with a MATE Desktop environment.
