The Double-Colon Rules Info page needs an example snippet.
I think I figured out a use just from reading the documentation however:
bus8.htm:: #always check for a fresher version
wget -N http://www.fybus.com.tw/bus8.htm
fybus.w3m:bus8.htm
w3m -cols 99 -dump $? > $@
Or an even more thrifty top line:
bus8.htm::
test `find $@ -ctime -1`||wget -N http://www.fybus.com.tw/bus8.htm
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