docker make docker-py

Step 26 : RUN git clone https://github.com/docker/docker-py.git /docker-py      && cd /docker-py        && git checkout -q $DOCKER_PY_COMMIT    && pip install -r test-requi[11/11257]
t
 ---> Running in 33127390b8a4
Cloning into '/docker-py'...
Requirement already satisfied (use --upgrade to upgrade): mock==1.0.1 in /usr/lib/python2.7/dist-packages (from -r test-requirements.txt (line 1))
Downloading/unpacking pytest==2.7.2 (from -r test-requirements.txt (line 2))
Downloading/unpacking coverage==3.7.1 (from -r test-requirements.txt (line 3))
  Running setup.py (path:/tmp/pip_build_root/coverage/setup.py) egg_info for package coverage
    
    warning: no previously-included files matching '*.pyc' found anywhere in distribution
Downloading/unpacking pytest-cov==2.1.0 (from -r test-requirements.txt (line 4))
  Downloading pytest_cov-2.1.0-py2.py3-none-any.whl
Downloading/unpacking flake8==2.4.1 (from -r test-requirements.txt (line 5))
  Downloading flake8-2.4.1-py2.py3-none-any.whl
Downloading/unpacking py>=1.4.29 (from pytest==2.7.2->-r test-requirements.txt (line 2))
Downloading/unpacking mccabe>=0.2.1,<0.4 (from flake8==2.4.1->-r test-requirements.txt (line 5))
  Downloading mccabe-0.3.1-py2.py3-none-any.whl
Downloading/unpacking pep8>=1.5.7,!=1.6.0,!=1.6.1,!=1.6.2 (from flake8==2.4.1->-r test-requirements.txt (line 5))
  Downloading pep8-1.5.7-py2.py3-none-any.whl
Downloading/unpacking pyflakes>=0.8.1,<0.9 (from flake8==2.4.1->-r test-requirements.txt (line 5))
  Downloading pyflakes-0.8.1-py2.py3-none-any.whl
Installing collected packages: pytest, coverage, pytest-cov, flake8, py, mccabe, pep8, pyflakes
  Running setup.py install for coverage
    building 'coverage.tracer' extension
    x86_64-linux-gnu-gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c coverage/tracer.c -o build/temp.linux-x86_6
4-2.7/coverage/tracer.o
    coverage/tracer.c:3:20: fatal error: Python.h: No such file or directory
     #include "Python.h"
                        ^
    compilation terminated.
    **
    ** Couldn't install with extension module, trying without it...
    ** BuildFailed: command 'x86_64-linux-gnu-gcc' failed with exit status 1
    **
    
    warning: no previously-included files matching '*.pyc' found anywhere in distribution
    Installing coverage2 script to /usr/local/bin
    Installing coverage-2.7 script to /usr/local/bin
    Installing coverage script to /usr/local/bin
Successfully installed pytest coverage pytest-cov flake8 py mccabe pep8 pyflakes
Cleaning up...