cocoapi - error: pycocotools/_mask.c: No such file or directory

strong@foreverstrong:~/darknet_model_validation/coco_detection_evaluation/cocoapi/PythonAPI$ make
python setup.py build_ext --inplace
running build_ext
building 'pycocotools._mask' extension
creating build
creating build/common
creating build/temp.linux-x86_64-2.7
creating build/temp.linux-x86_64-2.7/pycocotools
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/home/strong/.local/lib/python2.7/site-packages/numpy/core/include -I../common -I/usr/include/python2.7 -c ../common/maskApi.c -o build/temp.linux-x86_64-2.7/../common/maskApi.o -Wno-cpp -Wno-unused-function -std=c99
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/home/strong/.local/lib/python2.7/site-packages/numpy/core/include -I../common -I/usr/include/python2.7 -c pycocotools/_mask.c -o build/temp.linux-x86_64-2.7/pycocotools/_mask.o -Wno-cpp -Wno-unused-function -std=c99
x86_64-linux-gnu-gcc: error: pycocotools/_mask.c: No such file or directory
x86_64-linux-gnu-gcc: fatal error: no input files
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
Makefile:3: recipe for target 'all' failed
make: *** [all] Error 1

strong@foreverstrong:~/darknet_model_validation/coco_detection_evaluation/cocoapi/PythonAPI$ pip install cython
Collecting cython
  Downloading https://files.pythonhosted.org/packages/fe/d6/a097bd9913cc0fc974b968f5586d3f0609f46ca58b2aae3b8dfd51c1fe18/Cython-0.28.2-cp27-cp27mu-manylinux1_x86_64.whl (3.3MB)
    100% |████████████████████████████████| 3.3MB 499kB/s 
Installing collected packages: cython
Exception:
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/usr/local/lib/python2.7/dist-packages/pip/commands/install.py", line 342, in run
    prefix=options.prefix_path,
  File "/usr/local/lib/python2.7/dist-packages/pip/req/req_set.py", line 784, in install
    **kwargs
  File "/usr/local/lib/python2.7/dist-packages/pip/req/req_install.py", line 851, in install
    self.move_wheel_files(self.source_dir, root=root, prefix=prefix)
  File "/usr/local/lib/python2.7/dist-packages/pip/req/req_install.py", line 1064, in move_wheel_files
    isolated=self.isolated,
  File "/usr/local/lib/python2.7/dist-packages/pip/wheel.py", line 345, in move_wheel_files
    clobber(source, lib_dir, True)
  File "/usr/local/lib/python2.7/dist-packages/pip/wheel.py", line 323, in clobber
    shutil.copyfile(srcfile, destfile)
  File "/usr/lib/python2.7/shutil.py", line 83, in copyfile
    with open(dst, 'wb') as fdst:
IOError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/dist-packages/cython.pyc'
You are using pip version 9.0.1, however version 10.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

strong@foreverstrong:~/darknet_model_validation/coco_detection_evaluation/cocoapi/PythonAPI$ sudo pip install cython
[sudo] password for strong: 
The directory '/home/strong/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/home/strong/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting cython
  Downloading https://files.pythonhosted.org/packages/fe/d6/a097bd9913cc0fc974b968f5586d3f0609f46ca58b2aae3b8dfd51c1fe18/Cython-0.28.2-cp27-cp27mu-manylinux1_x86_64.whl (3.3MB)
    100% |████████████████████████████████| 3.3MB 516kB/s 
Installing collected packages: cython
Successfully installed cython-0.28.2
You are using pip version 9.0.1, however version 10.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

strong@foreverstrong:~/darknet_model_validation/coco_detection_evaluation/cocoapi/PythonAPI$ make
python setup.py build_ext --inplace
running build_ext
cythoning pycocotools/_mask.pyx to pycocotools/_mask.c
building 'pycocotools._mask' extension
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/home/strong/.local/lib/python2.7/site-packages/numpy/core/include -I../common -I/usr/include/python2.7 -c ../common/maskApi.c -o build/temp.linux-x86_64-2.7/../common/maskApi.o -Wno-cpp -Wno-unused-function -std=c99
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/home/strong/.local/lib/python2.7/site-packages/numpy/core/include -I../common -I/usr/include/python2.7 -c pycocotools/_mask.c -o build/temp.linux-x86_64-2.7/pycocotools/_mask.o -Wno-cpp -Wno-unused-function -std=c99
creating build/lib.linux-x86_64-2.7
creating build/lib.linux-x86_64-2.7/pycocotools
x86_64-linux-gnu-gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -Wl,-Bsymbolic-functions -Wl,-z,relro -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -Wl,-Bsymbolic-functions -Wl,-z,relro -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security build/temp.linux-x86_64-2.7/../common/maskApi.o build/temp.linux-x86_64-2.7/pycocotools/_mask.o -o build/lib.linux-x86_64-2.7/pycocotools/_mask.so
copying build/lib.linux-x86_64-2.7/pycocotools/_mask.so -> pycocotools
rm -rf build
strong@foreverstrong:~/darknet_model_validation/coco_detection_evaluation/cocoapi/PythonAPI$