A fix for mac version test.

Makefile

@@ -27,7 +27,7 @@ setup: venv
 	$(PIP) install -r requirements-dev.txt
 
 .venv/bin/python:
-	virtualenv .venv
+	test -d .venv || which python3 && python3 -m venv .venv || virtualenv .venv
 
 .PHONY: clean
 clean:
@@ -45,7 +45,6 @@ develop: .venv/lib/python*/site-packages/readability-lxml.egg-link
 .PHONY: clean_all
 clean_all: clean_venv
 
-
 # ###########
 # Deploy
 # ###########

setup.py

@@ -12,8 +12,8 @@ if sys.platform == "darwin":
     import platform
 
     mac_ver = platform.mac_ver()[0]
-    mac_ver_no = int(mac_ver.split(".")[1])
-    if mac_ver_no < 9:
+    mac_major, mac_minor = mac_ver.split('.')[:2]
+    if int(mac_major) == 10 and int(mac_minor) < 9:
         print("Using lxml<2.4")
         lxml_requirement = "lxml<2.4"