-sedhead='s/@<:@0-9@:>@@<:@0-9@:>@*/<<<&>>>/'
-sedtail='s/.*<<<\(.*\)>>>.*/\1/;t;s/.*/0/'
-png_min_major=`printf '%s' '$1' | sed -e "$sedhead"1 -e "$sedtail"`
-png_min_minor=`printf '%s' '$1' | sed -e "$sedhead"2 -e "$sedtail"`
-png_min_release=`printf '%s' '$1' | sed -e "$sedhead"3 -e "$sedtail"`
-png_min_build=`printf '%s' '$1' | sed -e "$sedhead"4 -e "$sedtail"`
+shead='s/@<:@0-9@:>@@<:@0-9@:>@*/<<<&>>>/'
+sbody='s/.*<<<\(.*\)>>>.*/\1/;t'
+stail='s/.*/0/'
+png_min_major=`printf '%s' '$1' | sed -e "$shead"1 -e "$sbody" -e "$stail"`
+png_min_minor=`printf '%s' '$1' | sed -e "$shead"2 -e "$sbody" -e "$stail"`
+png_min_release=`printf '%s' '$1' | sed -e "$shead"3 -e "$sbody" -e "$stail"`
+png_min_build=`printf '%s' '$1' | sed -e "$shead"4 -e "$sbody" -e "$stail"`