Make sure the correct version of Cython is called from Makefile

Author: elprans

Makefile

@@ -21,14 +21,16 @@ check-env:
 
 compile: check-env clean
 	echo "DEF DEBUG = 0" > asyncpg/protocol/__debug.pxi
-	cython asyncpg/protocol/protocol.pyx; rm asyncpg/protocol/__debug.pxi
+	$(PYTHON) -m cython asyncpg/protocol/protocol.pyx
+	rm asyncpg/protocol/__debug.pxi
 	@echo "$$CYTHON_BUILD_PATCH_SCRIPT" | $(PYTHON)
 	$(PYTHON) setup.py build_ext --inplace
 
 
 debug: check-env clean
 	echo "DEF DEBUG = 1" > asyncpg/protocol/__debug.pxi
-	cython -a -X linetrace=True asyncpg/protocol/protocol.pyx; rm asyncpg/protocol/__debug.pxi
+	$(PYTHON) -m cython -a -X linetrace=True asyncpg/protocol/protocol.pyx
+	rm asyncpg/protocol/__debug.pxi
 	@echo "$$CYTHON_BUILD_PATCH_SCRIPT" | $(PYTHON)
 	CFLAGS="${CFLAGS} -DCYTHON_TRACE=1 -DCYTHON_TRACE_NOGIL=1" \
 		$(PYTHON) setup.py build_ext --inplace --debug