we used to see Gimp with triple windows view with the last stable release of Gimp for tool box, editing window, and ” layers, patterns, channels, undo, brushes”. But Now with the development release it’s just single window mode for all three windows, and it’s fully customizable for dragging elements all over this window.
compiling operation for the development release is annoying for me a little bit, cause it has some extra dependencies specially with gegl and babl packages, you will find installation readme file on gimp folder follow instruction there to get it right. Download Gimp Development release.
check these posts reviewing the development release of Gimp 2.7.1 and How is Gimp 2.8 look going to be!