+proc about {} {
+ set w .about
+ if {[winfo exists $w]} {
+ raise $w
+ return
+ }
+ toplevel $w
+ wm title $w "About gitk"
+ message $w.m -text {
+Gitk version 0.9
+
+Copyright © 2005 Paul Mackerras
+
+Use and redistribute under the terms of the GNU General Public License
+
+(CVS $Revision: 1.7 $)} \
+ -justify center -aspect 400
+ pack $w.m -side top -fill x -padx 20 -pady 20
+ button $w.ok -text Close -command "destroy $w"
+ pack $w.ok -side bottom
+}
+