Created attachment 572686 [details] build.log /usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: /usr/lib64/libgtkmm-3.0.so: undefined reference to `Gtk::Plug_Class::wrap_new(_GObject*)' /usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: /usr/lib64/libgtkmm-3.0.so: undefined reference to `Gtk::Socket::get_type()' /usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: /usr/lib64/libgtkmm-3.0.so: undefined reference to `Gtk::Plug::get_type()' /usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: /usr/lib64/libgtkmm-3.0.so: undefined reference to `Gtk::Socket_Class::wrap_new(_GObject*)' collect2: error: ld returned 1 exit status ninja: build stopped: subcommand failed.
Created attachment 572688 [details] emerge --info
You need to re-emerge dev-cpp/gtkmm after you upgrade x11-libs/gtk+.
(In reply to Jeroen Roovers from comment #2) > You need to re-emerge dev-cpp/gtkmm after you upgrade x11-libs/gtk+. Does not help. This bug now is also actual for gnome-system-monitor-3.32.1.
So as per IRC chats and tests, this seems to be gnome-system-monitor not only depending on X stuff for the wnck stuff, but also unconditionally having some Gtk::Socket and Gtk::Plug_Class stuff, which are X11isms, so it needs gtkmm[X] unconditionally right now, with more details to be looked into.