$ emerge -s gtk+
Searching...   
[ Results for search key : gtk+ ]
[ Applications found : 2 ]
 
*  x11-libs/gtk+
      Latest version available: 2.12.8
      Latest version installed: 2.12.8
      Size of files: 15,724 kB
      Homepage:      http://www.gtk.org/
      Description:   Gimp ToolKit +
      License:       LGPL-2