fix building groupConnectivity.so

Makefile

@@ -4,7 +4,7 @@ default: groupConnectivity.so clean_obj
 
 groupConnectivity.so: groupConnectivity.pyx group-connectivity.h setup.py compileTimeOptions.h generateCompileTimeOptions.sh rings.h fast-array.h twoCuts.h parmap.py groupConnectivityNaive.py
 	./generateCompileTimeOptions.sh > options.h
-	python setup.py build_ext
+	python2 setup.py build_ext
 	cp build/lib*/groupConnectivity.so .
 
 clean_obj:

groupConnectivityNaive.py

@@ -155,6 +155,7 @@ if __name__ == "__main__":
   (f, t) = doctest.testmod()
   print "%s: %i tests of %i failed." % (__file__, f, t)
   if f > 0:
+    from sys import exit
     exit(1)
 
 

parmap.py

@@ -146,5 +146,6 @@ if __name__ == "__main__":
   (f, t) = doctest.testmod()
   print "%s: %i tests of %i failed." % (__file__, f, t)
   if f > 0:
+    from sys import exit
     exit(1)