Can't install Pillow in Windows

Question

The installation process asks for zlib and I even setup & cloned it from Github. I'm new to all of this.

Error message:

C:\Users\GThell\Pillow>pip install -e .
Obtaining file:///C:/Users/GThell/Pillow
Requirement already satisfied: olefile in c:\users\gthell\appdata\local\programs\python\python36\lib\site-packages (from Pillow==3.5.0.dev0)
Installing collected packages: Pillow
  Running setup.py develop for Pillow
    Complete output from command c:\users\gthell\appdata\local\programs\python\python36\python.exe -c "import setuptools, tokenize;__file__='C:\\Users\\GThell\\Pillow\\setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" develop --no-deps:
    Single threaded build for windows
    running develop
    running egg_info
    writing Pillow.egg-info\PKG-INFO
    writing dependency_links to Pillow.egg-info\dependency_links.txt
    writing requirements to Pillow.egg-info\requires.txt
    writing top-level names to Pillow.egg-info\top_level.txt
    warning: manifest_maker: standard file '-c' not found

    reading manifest file 'Pillow.egg-info\SOURCES.txt'
    reading manifest template 'MANIFEST.in'
    warning: no previously-included files found matching '.coveragerc'
    warning: no previously-included files found matching '.editorconfig'
    warning: no previously-included files found matching '.landscape.yaml'
    warning: no previously-included files found matching 'appveyor.yml'
    warning: no previously-included files found matching 'tox.ini'
    warning: no previously-included files matching '*.pyc' found anywhere in distribution
    warning: no previously-included files matching '*.so' found anywhere in distribution
    writing manifest file 'Pillow.egg-info\SOURCES.txt'
    running build_ext


    The headers or library files could not be found for zlib,
    a required dependency when compiling Pillow from source.

    Please see the install instructions at:
       http://pillow.readthedocs.io/en/latest/installation.html

    Traceback (most recent call last):
      File "C:\Users\GThell\Pillow\setup.py", line 778, in <module>
        zip_safe=not debug_build(), )
      File "c:\users\gthell\appdata\local\programs\python\python36\lib\distutils\core.py", line 148, in setup
        dist.run_commands()
      File "c:\users\gthell\appdata\local\programs\python\python36\lib\distutils\dist.py", line 955, in run_commands
        self.run_command(cmd)
      File "c:\users\gthell\appdata\local\programs\python\python36\lib\distutils\dist.py", line 974, in run_command
        cmd_obj.run()
      File "c:\users\gthell\appdata\local\programs\python\python36\lib\site-packages\setuptools\command\develop.py", line 34, in run
        self.install_for_development()
      File "c:\users\gthell\appdata\local\programs\python\python36\lib\site-packages\setuptools\command\develop.py", line 119, in install_for_development
        self.run_command('build_ext')
      File "c:\users\gthell\appdata\local\programs\python\python36\lib\distutils\cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "c:\users\gthell\appdata\local\programs\python\python36\lib\distutils\dist.py", line 974, in run_command
        cmd_obj.run()
      File "c:\users\gthell\appdata\local\programs\python\python36\lib\distutils\command\build_ext.py", line 339, in run
        self.build_extensions()
      File "C:\Users\GThell\Pillow\setup.py", line 549, in build_extensions
        raise RequiredDependencyException(f)
    __main__.RequiredDependencyException: zlib

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "C:\Users\GThell\Pillow\setup.py", line 790, in <module>
        raise RequiredDependencyException(msg)
    __main__.RequiredDependencyException:

    The headers or library files could not be found for zlib,
    a required dependency when compiling Pillow from source.

    Please see the install instructions at:
       http://pillow.readthedocs.io/en/latest/installation.html

Answer 1

use:

easy_install pillow

pip doesn't work somehow

Answer 2

I have recently installed Pillow under Cygwin's Python3.6 and needed following packages:

• gcc-core
• libjpeg-devel
• zlib-devel
• python3-devel
• python3-setuptools (to run easy-install-3.6)

I have also installed pip using:

easy-install-3.6 install pip

Then finally:

pip3 install pillow

succeeded.