example in the gtkmm 3 docs is not working

[Peter Wiehe <pwiehe hotmail de>]

Hello!


The example in the gtkmm 3 docs is not working:


https://developer.gnome.org/gtkmm-tutorial/stable/sec-basics-simple-example.html


g++ says:

'app' does not name a type


I use:

Ubuntu 15.10

g++ (Ubuntu 5.2.1-22ubuntu2) 5.2.1 20151010


I downloaded and installed gtkmm and prerequisites today via

"apt-get install libgtkmm-3.0-dev"


Is it a mistake in the example or what can I do to solve this?


Greetings

Peter