Installing via pip fails

[ghost]

  Running setup.py install for cymem ... error   
    Complete output from command /home/me/stuff/venv/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-ls6b2vma/cymem/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-5l6ru3r9-record/install-record.txt --single-version-externally-managed --compile --install-headers /home/me/stuff/venv/include/site/python3.6/cymem:
    running install     
    running build       
    running build_py    
    creating build      
    creating build/lib.linux-x86_64-3.6          
    creating build/lib.linux-x86_64-3.6/cymem    
    copying cymem/about.py -> build/lib.linux-x86_64-3.6/cymem                                     
    copying cymem/__init__.py -> build/lib.linux-x86_64-3.6/cymem                                  
    package init file 'cymem/tests/__init__.py' not found (or not a regular file)                  
    creating build/lib.linux-x86_64-3.6/cymem/tests                                                
    copying cymem/tests/test_import.py -> build/lib.linux-x86_64-3.6/cymem/tests                   
    copying cymem/cymem.pyx -> build/lib.linux-x86_64-3.6/cymem                                    
    copying cymem/cymem.pxd -> build/lib.linux-x86_64-3.6/cymem                                    
    copying cymem/__init__.pxd -> build/lib.linux-x86_64-3.6/cymem                                 
    running build_ext   
    building 'cymem.cymem' extension             
    creating build/temp.linux-x86_64-3.6         
    creating build/temp.linux-x86_64-3.6/cymem   
    x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -g -fdebug-prefix-map=/build/python3.6-sXpGnM/python3.6-3.6.3=. -specs=/usr/share/dpkg/no-pie-compile.specs -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I/usr/include/python3.6m -I/home/me/stuff/venv/include -I/usr/include/python3.6m -c cymem/cymem.cpp -o build/temp.linux-x86_64-3.6/cymem/cymem.o -O3 -Wno-strict-prototypes -Wno-unused-function
    x86_64-linux-gnu-gcc: error: cymem/cymem.cpp: 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        

[ghost]

I just needed to pip install wheel firsrt, before installing cymem (via pip install spacy).

I'm going to close this issue, but you might consider putting wheel in the requirements file?