title: pip install tesserocr fails with error " Failed building wheel for tesserocr"
body: <blockquote>
    <p>I already have the latest builds for leptonica and tesseract</p>
  
  <pre><code>tesseract 4.00.00alpha-365-gcf0b378
   leptonica-1.74.1
    libjpeg 8d (libjpeg-turbo 1.3.0) : libpng 1.2.50 : libtiff 4.0.3 : zlib 1.2.8
  </code></pre>
  </blockquote>
  
  <p>i have also installed all dependencies like python-dev </p>
  
  <blockquote>
    <p>This the error i'm getting when i do pip install tesserocr in my
    virtualenv</p>
  </blockquote>
  
  <pre><code>Collecting tesserocr
        Using cached tesserocr-2.1.3.tar.gz
      Building wheels for collected packages: tesserocr
        Running setup.py bdist_wheel for tesserocr ... error
        Complete output from command /home/ajay/virtualenvs/v2/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-L3JmI9/tesserocr/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/tmpUIPX1spip-wheel- --python-tag cp27:
        running bdist_wheel
        running build
        running build_ext
        Supporting tesseract v4.00.00dev
        Configs from pkg-config: {'libraries': ['lept', 'tesseract'], 'cython_compile_time_env': {'TESSERACT_VERSION': 262144}, 'library_dirs': ['/usr/local/lib'], 'include_dirs': ['/usr/local/include']}
        cythoning tesserocr.pyx to tesserocr.cpp
        building 'tesserocr' extension
        creating build
        creating build/temp.linux-x86_64-2.7
        x86_64-linux-gnu-gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -I/usr/local/include -fPIC -I/usr/local/include -I/usr/include/python2.7 -c tesserocr.cpp -o build/temp.linux-x86_64-2.7/tesserocr.o
        cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++ [enabled by default]
        In file included from /usr/local/include/tesseract/genericvector.h:29:0,
                         from tesserocr.cpp:449:
        /usr/local/include/tesseract/helpers.h: In member function ‘void tesseract::TRand::set_seed(const string&amp;)’:
        /usr/local/include/tesseract/helpers.h:50:5: error: ‘hash’ is not a member of ‘std’
             std::hash&lt;std::string&gt; hasher;
             ^
        /usr/local/include/tesseract/helpers.h:50:26: error: expected primary-expression before ‘&gt;’ token
             std::hash&lt;std::string&gt; hasher;
                                  ^
        /usr/local/include/tesseract/helpers.h:50:28: error: ‘hasher’ was not declared in this scope
             std::hash&lt;std::string&gt; hasher;
                                    ^
        tesserocr.cpp: In function ‘tesseract::TessResultRenderer* __pyx_f_9tesserocr_13PyTessBaseAPI__get_renderer(__pyx_obj_9tesserocr_PyTessBaseAPI*, __pyx_t_9tesseract_cchar_t*)’:
        tesserocr.cpp:16699:106: error: no matching function for call to ‘tesseract::TessPDFRenderer::TessPDFRenderer(__pyx_t_9tesseract_cchar_t*&amp;, const char*)’
               __pyx_t_7 = new tesseract::TessPDFRenderer(__pyx_v_outputbase, __pyx_v_self-&gt;_baseapi.GetDatapath());
                                                                                                                  ^
        tesserocr.cpp:16699:106: note: candidates are:
        In file included from tesserocr.cpp:459:0:
        /usr/local/include/tesseract/renderer.h:190:3: note: tesseract::TessPDFRenderer::TessPDFRenderer(const char*, const char*, bool)
           TessPDFRenderer(const char* outputbase, const char* datadir, bool textonly);
           ^
        /usr/local/include/tesseract/renderer.h:190:3: note:   candidate expects 3 arguments, 2 provided
        /usr/local/include/tesseract/renderer.h:186:16: note: tesseract::TessPDFRenderer::TessPDFRenderer(const tesseract::TessPDFRenderer&amp;)
         class TESS_API TessPDFRenderer : public TessResultRenderer {
                        ^
        /usr/local/include/tesseract/renderer.h:186:16: note:   candidate expects 1 argument, 2 provided
        error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
  
        ----------------------------------------
        Failed building wheel for tesserocr
        Running setup.py clean for tesserocr
      Failed to build tesserocr
      Installing collected packages: tesserocr
        Running setup.py install for tesserocr ... error
          Complete output from command /home/ajay/virtualenvs/v2/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-L3JmI9/tesserocr/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-6eGBXb-record/install-record.txt --single-version-externally-managed --compile --install-headers /home/ajay/virtualenvs/v2/include/site/python2.7/tesserocr:
          running install
          running build
          running build_ext
          Supporting tesseract v4.00.00dev
          Configs from pkg-config: {'libraries': ['lept', 'tesseract'], 'cython_compile_time_env': {'TESSERACT_VERSION': 262144}, 'library_dirs': ['/usr/local/lib'], 'include_dirs': ['/usr/local/include']}
          skipping 'tesserocr.cpp' Cython extension (up-to-date)
          building 'tesserocr' extension
          creating build
          creating build/temp.linux-x86_64-2.7
          x86_64-linux-gnu-gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -I/usr/local/include -fPIC -I/usr/local/include -I/usr/include/python2.7 -c tesserocr.cpp -o build/temp.linux-x86_64-2.7/tesserocr.o
          cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++ [enabled by default]
          In file included from /usr/local/include/tesseract/genericvector.h:29:0,
                           from tesserocr.cpp:449:
          /usr/local/include/tesseract/helpers.h: In member function ‘void tesseract::TRand::set_seed(const string&amp;)’:
          /usr/local/include/tesseract/helpers.h:50:5: error: ‘hash’ is not a member of ‘std’
               std::hash&lt;std::string&gt; hasher;
               ^
          /usr/local/include/tesseract/helpers.h:50:26: error: expected primary-expression before ‘&gt;’ token
               std::hash&lt;std::string&gt; hasher;
                                    ^
          /usr/local/include/tesseract/helpers.h:50:28: error: ‘hasher’ was not declared in this scope
               std::hash&lt;std::string&gt; hasher;
                                      ^
          tesserocr.cpp: In function ‘tesseract::TessResultRenderer* __pyx_f_9tesserocr_13PyTessBaseAPI__get_renderer(__pyx_obj_9tesserocr_PyTessBaseAPI*, __pyx_t_9tesseract_cchar_t*)’:
          tesserocr.cpp:16699:106: error: no matching function for call to ‘tesseract::TessPDFRenderer::TessPDFRenderer(__pyx_t_9tesseract_cchar_t*&amp;, const char*)’
                 __pyx_t_7 = new tesseract::TessPDFRenderer(__pyx_v_outputbase, __pyx_v_self-&gt;_baseapi.GetDatapath());
                                                                                                                    ^
          tesserocr.cpp:16699:106: note: candidates are:
          In file included from tesserocr.cpp:459:0:
          /usr/local/include/tesseract/renderer.h:190:3: note: tesseract::TessPDFRenderer::TessPDFRenderer(const char*, const char*, bool)
             TessPDFRenderer(const char* outputbase, const char* datadir, bool textonly);
             ^
          /usr/local/include/tesseract/renderer.h:190:3: note:   candidate expects 3 arguments, 2 provided
          /usr/local/include/tesseract/renderer.h:186:16: note: tesseract::TessPDFRenderer::TessPDFRenderer(const tesseract::TessPDFRenderer&amp;)
           class TESS_API TessPDFRenderer : public TessResultRenderer {
                          ^
          /usr/local/include/tesseract/renderer.h:186:16: note:   candidate expects 1 argument, 2 provided
          error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
  </code></pre>
  
  <blockquote>
    <p>I get this error at the bottom</p>
  </blockquote>
  
  <pre><code>        ----------------------------------------
      Command "/home/ajay/virtualenvs/v2/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-L3JmI9/tesserocr/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-6eGBXb-record/install-record.txt --single-version-externally-managed --compile --install-headers /home/ajay/virtualenvs/v2/include/site/python2.7/tesserocr" failed with error code 1 in /tmp/pip-build-L3JmI9/tesserocr/
  </code></pre>