$ git checkout -b gtk2

Switched to a new branch 'gtk2'

$ git branch -d master

Deleted branch master (was 1077c4ba).

$ git checkout gtk3

Branch gtk3 set up to track remote branch gtk3 from origin.

Switched to a new branch 'gtk3'

$ git checkout -b dev

Switched to a new branch 'dev'

$ git branch -d gtk3

Deleted branch gtk3 (was 50114c1a).