Make specs expects Python 2

Author: effigies

Makefile

@@ -70,7 +70,7 @@ html:
 
 specs:
 	@echo "Checking specs and autogenerating spec tests"
-	env PYTHONPATH=".:$(PYTHONPATH)" python tools/checkspecs.py
+	env PYTHONPATH=".:$(PYTHONPATH)" python2 tools/checkspecs.py
 
 check: check-before-commit # just a shortcut
 check-before-commit: specs trailing-spaces html test