EnvironmentError: The nvcc binary could not be located in your $PATH. Either add it to your path, or set $CUDAHOME

[RobinLiu1987]

The system environment used：
VMware Workstation 15 Pro + Ubuntu18.0 + Python2.7 + Tensorflow1.2.1 + opencv-python 4.2.0
I'd like to install R-DFPN_FPN_Tensorflow in CPU ONLY mode. Is this possible? Which configuration files should I modify? Can I get rid of cude software？
Here is a list of the files That I have modified：
$R-DFPN_ROOT//libs/configs/cfgs.py（modify the parameters of NMS and IOU functions use_gpu = False）
python setup.py build_ext --inplace
I got：
python setup.py build_ext --inplace
Traceback (most recent call last):
File "setup.py", line 59, in
CUDA = locate_cuda()
File "setup.py", line 47, in locate_cuda
raise EnvironmentError('The nvcc binary could not be '
EnvironmentError: The nvcc binary could not be located in your $PATH. Either add it to your path, or set $CUDAHOME