From 3547abd3cca9c3300f0eb00a3d63025b5562533f Mon Sep 17 00:00:00 2001
From: Chris Laws <clawsicus@gmail.com>
Date: Wed, 18 Dec 2013 09:05:52 +1030
Subject: [PATCH] Add CZMQ version check to installer

---
 pyczmq/__init__.py |  1 +
 pyczmq/zsys.py     | 18 ++++++++++++++++++
 setup.py           |  5 +++--
 3 files changed, 22 insertions(+), 2 deletions(-)
 create mode 100644 pyczmq/zsys.py

diff --git a/pyczmq/__init__.py b/pyczmq/__init__.py
index 8582757..2d51adb 100644
--- a/pyczmq/__init__.py
+++ b/pyczmq/__init__.py
@@ -2,6 +2,7 @@
 
 from . import (
     zmq,
+    zsys,
     zctx,
     zsocket,
     zstr,
diff --git a/pyczmq/zsys.py b/pyczmq/zsys.py
new file mode 100644
index 0000000..b9e4eab
--- /dev/null
+++ b/pyczmq/zsys.py
@@ -0,0 +1,18 @@
+from pyczmq._cffi import C, ffi, cdef
+
+__doc__ = """
+The zsys class provides miscellaneous functions. Only a limited set of
+functions are exposed from the czmq zsys module as many duplicate
+functionality of built-in python types or libraries.
+"""
+
+@cdef('void zsys_version (int *major, int *minor, int *patch);')
+def zsys_version():
+    """
+    Returns the tuple (major, minor, patch) of the current czmq version.
+    """
+    major = ffi.new('int*')
+    minor= ffi.new('int*')
+    patch = ffi.new('int*')
+    C.zsys_version(major, minor, patch)
+    return (major[0], minor[0], patch[0])
diff --git a/setup.py b/setup.py
index e7119d5..88dfa46 100644
--- a/setup.py
+++ b/setup.py
@@ -5,12 +5,13 @@
 ======
 """
 from pyczmq.zmq import version as zmq_version
+from pyczmq.zsys import zsys_version as czmq_version
 from setuptools import setup, find_packages
 import sys
 
 
-if zmq_version() < (4,0,0):
-    print "ERROR: pyczmq requires libzmq 4.0.0 or later."
+if zmq_version() < (4,0,0) or czmq_version() < (2, 1, 0):
+    print "ERROR: pyczmq requires libzmq 4.0.0 or later and libczmq 2.1.0 or later"
     sys.exit(1)