no glpk

hanslovskyp@saalfelds-ws2 ~/git/nifty/build/python/nifty (git)-[master] % python ~/Downloads/nifty_mc_examples.py
Traceback (most recent call last):
  File "/home/hanslovskyp/Downloads/nifty_mc_examples.py", line 70, in <module>
    labels = nifty_exact(numberOfVariables, edges, costs)
  File "/home/hanslovskyp/Downloads/nifty_mc_examples.py", line 58, in nifty_exact
    addOnlyViolatedThreeCyclesConstraints=True
  File "/home/hanslovskyp/.conda/envs/py27/lib/python2.7/site-packages/nifty/__init__.py", line 83, in multicutIlpFactory
    s,F = getSettingsAndFactoryCls("MulticutIlpGlpk")
  File "/home/hanslovskyp/.conda/envs/py27/lib/python2.7/site-packages/nifty/__init__.py", line 29, in getSettingsAndFactoryCls
    s =  getSettings(baseName)
  File "/home/hanslovskyp/.conda/envs/py27/lib/python2.7/site-packages/nifty/__init__.py", line 26, in getSettings
    S =  getSettingsCls(baseName)
  File "/home/hanslovskyp/.conda/envs/py27/lib/python2.7/site-packages/nifty/__init__.py", line 20, in getSettingsCls
    S =  getCls(mcMod, baseName + "Settings" ,objectiveName)
  File "/home/hanslovskyp/.conda/envs/py27/lib/python2.7/site-packages/nifty/__init__.py", line 17, in getCls
    return module.__dict__[prefix+postfix]
KeyError: 'MulticutIlpGlpkSettingsMulticutObjectiveUndirectedGraph'