development installation fails because of shapely

[daniviga]

  Downloading http://172.16.12.209:8080/root/pypi/+f/afb/3feef824bde12/Shapely-1.5.17.tar.gz (180kB)
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 20, in <module>
      File "/tmp/pip-build-3APG3I/shapely/setup.py", line 38, in <module>
        from shapely._buildcfg import geos_version_string, geos_version, \
      File "shapely/_buildcfg.py", line 88, in <module>
        clibs = get_geos_config('--clibs')
      File "shapely/_buildcfg.py", line 77, in get_geos_config
        raise ValueError(stderr.strip())
    ValueError: Usage: geos-config [OPTIONS]
    Options:
         [--prefix]
         [--version]
         [--libs]
         [--cflags]
         [--ldflags]
         [--includes]
         [--jtsport]

    ----------------------------------------
    Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-3APG3I/shapely