Cairo Functionalities

Hi,

Can we make cairo a hard dependency for php-gtk? There are several functions
which require cairo support.

The famous ones include the gtk_print_context_* ones. More importantly,
direct cairo drawing support can be added by returning a CairoContext object
 from gdkWindow - leading to the availability of custom widgets.

So, we plan to define an #ifdef if cairo is found, and if it is not, we
simply don't build the corresponding methods (much like how the 2.8/2.10
overrides are handled currently). Is this approach OK?

Any comments or suggestions are greatly appreciated.

Regards,
Akshat Gupta