use automatic variables in challenge-bot.html

diff --git a/curriculum/makefile b/curriculum/makefile
index ebc4ee02793bc04314d3798db49d4a42aad77fc0..b63ddcfd0189fbaa66a83e25a95a6dd4abe38f3f 100644 (file)
--- a/curriculum/makefile
+++ b/curriculum/makefile
@@ -77,7 +77,7 @@ challenge-bot.html: challenge-bot.scm \
                arduino-to-deck/6-32-screw.png \
                arduino-to-deck/4-place-arduino-closeup.png \
                makefile
-       @skribilo challenge-bot.scm > challenge-bot.html
+       @skribilo $< > $@
 
 clean:
        @rm -f \