Accept Python2 and Python3

Makefile

@@ -1,6 +1,6 @@
 # ZeroMQ header file
 
-CC=gcc -fPIC 
+CC=gcc -fPIC
 CFLAGS=-O3 -Wall -pedantic -g
 PREFIX=/usr/local/
 
@@ -9,22 +9,22 @@ PREFIX=/usr/local/
 default: libf77zmq.so libf77zmq.a f77_zmq.h
 
 install: libf77zmq.so libf77zmq.a f77_zmq.h
-	install -D -m 644 libf77zmq.a $(PREFIX)/lib/ 
-	install -D -m 644 libf77zmq.so $(PREFIX)/lib/ 
-	install -D -m 644 f77_zmq.h $(PREFIX)/include/ 
-	install -D -m 644 f77_zmq_free.h $(PREFIX)/include/ 
+	install -D -m 644 libf77zmq.a $(PREFIX)/lib/
+	install -D -m 644 libf77zmq.so $(PREFIX)/lib/
+	install -D -m 644 f77_zmq.h $(PREFIX)/include/
+	install -D -m 644 f77_zmq_free.h $(PREFIX)/include/
 
 libf77zmq.so: f77_zmq.o
 	$(CC) -shared $^ -o $@
 
-libf77zmq.a: f77_zmq.o 
+libf77zmq.a: f77_zmq.o
 	$(AR) cr $@  $^
 
 f77_zmq.o: f77_zmq.c f77_zmq.h
 	$(CC) $(CFLAGS) -c f77_zmq.c -o $@
 
 f77_zmq.h: create_f77_zmq_h.py f77_zmq.c
-	python3 create_f77_zmq_h.py 
+	python create_f77_zmq_h.py
 
 clean:
 	$(RM) -f -- f77_zmq.o f77_zmq.h

create_f77_zmq_h.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
 #
 #    f77_zmq : Fortran 77 bindings for the ZeroMQ library
 #    Copyright (C) 2014 Anthony Scemama
@@ -24,12 +24,16 @@
 # Universite Paul Sabatier - Bat. 3R1b4, 118 route de Narbonne
 # 31062 Toulouse Cedex 09, France
 
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
 
 import re
 import os
 import sys
 import ctypes
 
+
 def create_lines(f):
   result = f.read()
   result = result.replace('\\\n', '')
@@ -121,7 +125,7 @@ def find_ZMQ_H():
             v = os.environ.get("C_INCLUDE_PATH")
         if v is None:
             v = "/usr/include:/usr/local/include"
-            
+
         for d in v.split(':'):
             if d and "zmq.h" in os.listdir(d):
                 return ("{0}/zmq.h".format(d))