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Install failure of cupy==1.0.0.1 on Ubuntu 14.04, Cuda 8.0.61, Cudnn 6.0.21

See original GitHub issue

$ echo $PATH
/usr/local/cuda/bin:/home/wkentaro/.local/bin:/usr/local/bin:/usr/local/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
$ echo $LD_LIBRARY_PATH
/usr/local/cuda/lib64:
$ echo $CFLAGS
-I/usr/local/cuda/include
$ echo $LDFLAGS
-L/usr/local/cuda/lib64
$ sudo pip install cupy --no-cache-dir -vvv
...
    building 'cupy.cuda.thrust' extension
    error: unknown file type '.cu' (from 'cupy/cuda/cupy_thrust.cu')
    Running setup.py install for cupy: finished with status 'error'
Cleaning up...

full log

It says below unexpectedly.

    **************************************************
    *** WARNING: nvcc not in path.
    *** WARNING: Please set path to nvcc.
    **************************************************

Do anyone have some idea to fix this? It worked before I upgrade the cuda to 8.0.61 from 8.0.5X.