Error regarding CUDA in step 5-"Compile deformable convolutional (from DCNv2)."

[Prajwal Gupta]

after running ./make.sh, I am getting errors as follows-

Traceback (most recent call last):
  File "build.py", line 21, in <module>
    raise ValueError('CUDA is not available')
ValueError: CUDA is not available
Traceback (most recent call last):
  File "build_double.py", line 21, in <module>
    raise ValueError('CUDA is not available')
ValueError: CUDA is not available

any solution for this?