diff -up khal-0.7.0/doc/source/Makefile.py3 khal-0.7.0/doc/source/Makefile
--- khal-0.7.0/doc/source/Makefile.py3	2016-04-02 10:14:11.719092434 +0200
+++ khal-0.7.0/doc/source/Makefile	2016-04-02 10:14:24.016102937 +0200
@@ -1,4 +1,4 @@
 configspec.rst: ../../../khal-0.7.0/khal/settings/khal.spec generate_config.py
-	python generate_config.py > configspec.rst
+	python3 generate_config.py > configspec.rst
 
 .PHONY: configspec.rst