Can't locate object method "set_tab_hborder" via package "Gtk3::Notebook"

[Juergen Harms <juergen harms unige ch>]

Trying to convert a gtk2 application to gtk3, I get the above error 
message - looks like set_tab_hborder and set_tab_vborder is not mapped 
in Perl-Gtk3 (Mageia perl-Gtk3-0.9.0-1) - maybe also the corresponding 
get_... functions, I did not check - or is there another reason?

Subsidiary question: is there an easy way (example code would be very 
helpful) to include c-code for temporarily creating a workaround  for 
non-mapped methods at the level of the application? - I try to stick to 
what my friendly distro gives me in its rpm package).

Thanks, Juergen