lib/ref-add.sed

   1 /^# Packages using this file: / {
   2   s/# Packages using this file://
   3   ta
   4   :a
   5   s/ guile / guile /
   6   tb
   7   s/ $/ guile /
   8   :b
   9   s/^/# Packages using this file:/
  10 }