slackbuilds_ponce/graphics/gpicview

A Simple And Fast Image Viewer With Low Memory Usage. This little
program is not aimed to be powerful or feature-rich. It's aimed
to replace the default image viewer of current desktop systems.
Fast-startup, low memory usage, and a simple user interface make it a
good choice for default viewer.

If you want to build this for gtk+3, pass to the script the switch

  GTK3=yes