+puzzles.chm: preprocessed.but
+ halibut --chm=puzzles.chm preprocessed.but
+puzzles.hlp: preprocessed.but
+ halibut --winhelp=puzzles.hlp preprocessed.but
+puzzles.txt: preprocessed.but
+ halibut --text=puzzles.txt preprocessed.but
+
+HACKING: devel.but
+ halibut --text=HACKING devel.but
+
+clean:
+ rm -f puzzles.hlp puzzles.txt preprocessed.but HACKING *.html *.hh[pck]