Mac OSX does not support date -R

bootstrap.sh

@@ -216,7 +216,7 @@ done
 
 HEADER='## @id '"\$Id\$"'
 #
-# This file has been added by '${MY_NAME}' on '$(date -R)'
+# This file has been added by '${MY_NAME}' on '$(date +"%Y-%m-%d %H:%M %Z")'
 # Feel free to change it or even remove and rebuild it, up to your needs
 #
 ##       1         2         3         4         5         6         7         8