[gtkmm] popen temporaly stops application

[Dario Mèndez <DarioXP email it>]

I'm creating a tiny GTK application wich configures and compiles the 
linux kernel using GTKmm.

In order to show the make output, I've put a TextView widget and created 
a stream with popen().

It works, but the window keeps freezed during the make process, and 
"unfreezes" when it ends, showing the last line of the output.

Does anyone know how to prevent the window's freezing, maybe some 
property or some other command to open a stream containing the commands 
output?

Thanks in advance.