Trying with python 3 or python 3.5 get me SyntaxError: invalid token
Using python 2.7.9
#:/nmap/zenmap# python setup.py install
running install
running build
running build_py
running build_scripts
running install_lib
running install_scripts
changing mode of /usr/local/bin/zenmap to 755
running install_data
running install_egg_info
Writing /usr/local/lib/python2.7/site-packages/zenmap-7.40SVN-py2.7.egg-info
Traceback (most recent call last):
File "setup.py", line 652, in
setup(**setup_args)
File "/usr/local/lib/python2.7/distutils/core.py", line 151, in setup
dist.run_commands()
File "/usr/local/lib/python2.7/distutils/dist.py", line 953, in run_commands
self.run_command(cmd)
File "/usr/local/lib/python2.7/distutils/dist.py", line 972, in run_command
cmd_obj.run()
File "setup.py", line 249, in run
self.fix_paths()
File "setup.py", line 401, in fix_paths
"CONFIG_DIR": os.path.join(self.saved_prefix, config_dir),
File "/usr/local/lib/python2.7/posixpath.py", line 77, in join
elif path == '' or path.endswith('/'):
AttributeError: 'NoneType' object has no attribute 'endswith'

Nmap installed from git was perfect and is running ok , but zenmap is unable to install or open gui .