stgit.el: Verify that we're running on Emacs 22 or later

ewoc-create needs to have the NOSEP argument.
line-number-at-pos doesn't exist in older versions.

Signed-off-by: Gustav Hållberg <gustav@virtutech.com>

diff --git a/contrib/stgit.el b/contrib/stgit.el
index 31f36d79f199732714587bf51a4fe4db76eba19f..1b79bf16681a17e9e37ec853f0de3da37f390404 100644 (file)
--- a/contrib/stgit.el
+++ b/contrib/stgit.el
@@ -9,6 +9,9 @@
 ;;
 ;; To start: `M-x stgit'
 
+(when (< emacs-major-version 22)
+  (error "Emacs older than 22 is not supported by stgit.el"))
+
 (require 'git nil t)
 (require 'cl)
 (require 'ewoc)