How do I link gtkmm with g++ on linux

Question

I am creating a GUI with C++. So I installed gtkmm using the terminal line:

sudo apt-get install libgtkmm-3.0-dev

and included gtkmm using #include <gtkmm.h> . But when I followed a tutorial video and compiled my code:

g++ example.cpp -o out  `pkg-config --cflags gtk+-2.0` `pkg-config --libs gtk+-2.0`

I see an error:

In file included from example.cpp:1:0:
cross.hpp: In member function ‘void crossStd::gui_class::createWindow(int, int,std::__cxx11::string)’:
cross.hpp:95:9: error: ‘Gtk’ has not been declared
     Gtk::Main kit(argc,argv);
     ^~~
cross.hpp:96:9: error: ‘Gtk’ has not been declared
     Gtk::Window window;

I does not seem like it is linking gtkmm. What should I do to properly link gtk?

Answer 1

The appropriate include statement is:

#include <gtkmm/main.h>

That's according to the docs: https://developer.gnome.org/gtkmm/stable/classGtk_1_1Main.html

And you should always compile with -Wall to enable warnings, which might have told you that your #include <gtkmm.h> did not find any file.