how to define the root of caffe to digits? - caffe

Question

I have installed caffe on ubuntu 16.04, python 2.7, cuda 8, and have tested mnist on that. it worked fine.
Now I want to install digits. I have installed it but when I do ./digits-devserver, it gives me the following error:
#pc2user:~/digits$ ./digits-devserver
___ ___ ___ ___ _____ ___
| \_ _/ __|_ _|_ _/ __|
| |) | | (_ || | | | \__ \
|___/___\___|___| |_| |___/ 5.1-dev
Did you forget to "make pycaffe"?
"/home/user/caffe-master" from CAFFE_ROOT does not point to a valid installation of Caffe.
Use the envvar CAFFE_ROOT to indicate a valid installation.
Traceback (most recent call last):
File "/home/user/anaconda2/lib/python2.7/runpy.py", line 174, in _run_module_as_main
"__main__", fname, loader, pkg_name)
File "/home/user/anaconda2/lib/python2.7/runpy.py", line 72, in _run_code
exec code in run_globals
File "/home/user/digits/digits/__main__.py", line 70, in <module>
main()
File "/home/user/digits/digits/__main__.py", line 53, in main
import digits.config
File "digits/config/__init__.py", line 7, in <module>
from . import ( # noqa
File "digits/config/caffe.py", line 226, in <module>
executable, version, flavor = load_from_envvar('CAFFE_ROOT')
File "digits/config/caffe.py", line 37, in load_from_envvar
import_pycaffe(python_dir)
File "digits/config/caffe.py", line 126, in import_pycaffe
import caffe
File "/home/user/caffe-master/python/caffe/__init__.py", line 1, in <module>
from .pycaffe import Net, SGDSolver, NesterovSolver, AdaGradSolver, RMSPropSolver, AdaDeltaSolver, AdamSolver
File "/home/user/caffe-master/python/caffe/pycaffe.py", line 13, in <module>
from ._caffe import Net, SGDSolver, NesterovSolver, AdaGradSolver, \
ImportError: /home/user/anaconda2/lib/python2.7/site-packages/scipy/special/../../../../libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by /home/user/caffe-master/python/caffe/_caffe.so)
user#pc2user:~/digits$
Moreover, thsi is my ~/.profile:
Please help me to find out how to define the root of caffe to digits.