artful: errors while compiling against gtk3

kali@futeisha:~/go/src/0xacab.org/leap/bitmask-systray$ go get -u .
# github.com/gotk3/gotk3/gtk
../../../github.com/gotk3/gotk3/gtk/gtk_since_3_20.go:66: cannot use (*C.gchar)(cstr) (type *C.gchar) as type *C.char in argument to func literal
../../../github.com/gotk3/gotk3/gtk/gtk_since_3_20.go:71: cannot use (func literal)(v.native()) (type *C.char) as type *C.gchar in argument to stringReturn
../../../github.com/gotk3/gotk3/gtk/gtk_since_3_20.go:161: cannot use (*C.gchar)(cstr) (type *C.gchar) as type *C.char in argument to func literal
../../../github.com/gotk3/gotk3/gtk/gtk_since_3_20.go:166: cannot use (func literal)(v.native()) (type *C.char) as type *C.gchar in argument to stringReturn
../../../github.com/gotk3/gotk3/gtk/gtk_since_3_20.go:173: cannot use (*C.gchar)(cstr) (type *C.gchar) as type *C.char in argument to func literal
../../../github.com/gotk3/gotk3/gtk/gtk_since_3_20.go:178: cannot use (func literal)(v.native()) (type *C.char) as type *C.gchar in argument to stringReturn