make clean: No rule to make target 'clean'

[mjspeck]

make clean command does not work, even though it is in the Makefile:

#12 83.31 make -C dipcc clean
#12 83.31 make[1]: *** No rule to make target 'clean'.  Stop.
#12 83.31 make[1]: Entering directory '/diplomacy_searchbot/dipcc'
#12 83.31 make[1]: Leaving directory '/diplomacy_searchbot/dipcc'
#12 83.31 make: *** [Makefile:28: clean] Error 2