I haven't personally worked on fast-wireshark in some time but I may be able to help.
It looks like CMake does not have a finder installed for glib. Do you have an up-to-date version of cmake? If updating doesn't help, you may need to find a FindGLIB2.cmake finder file for CMake online, and add it to CMake's module folder (usually these are stored in /usr/share/cmake*/Modules). I'm not sure why glib wouldn't be included in cmake's preinstalled modules, though...
Wes