Variables in editfiles, setline

[Rune Mossige]

Hello,
I want to use a variable in an editfiles section, but using setline 
apparently does not allow variables...

I want to appent a crontab entry, where the minute field is calculated 
earlier in a module. I only want to append this crontab entry if a 
similar entry does not exist....I have tried:

editfiles:
  { /etc/crontab
      SetLine "$(MINUTE) 4,5,8,9,12,13,16,17 * * * root 
/gecoapp/share/rsync_computenodes""
      AppendIfNoLineMatching ".*rsync_computenodes.*"
    }

but then cfengine complains with:
Wildcards cannot be used in this context: 
cfengine:GST0H5::Execution terminated after parsing due to errors in 
program

How can I get around this? I am using 2.0.1.