[SOLVED] "The headers or library files could not be found for jpeg" installing Pillow on Alpine Linux

"The headers or library files could not be found for jpeg" installing Pillow on Alpine Linux

I'm trying to run Python's Scrapy in a Docker container based on python:alpine. It was working before, but now I'd like to use Scrapy's Image Pipeline which requires me to install Pillow.

As a simplified example, I tried the following Dockerfile:

FROM python:alpine
RUN apk --update add libxml2-dev libxslt-dev libffi-dev gcc musl-dev libgcc openssl-dev curl
RUN apk add libjpeg zlib tiff freetype lcms libwebp tcl openjpeg
RUN pip install Pillow

However, when I try to build this I get an error which contains the following:

Traceback (most recent call last):
  File "/tmp/pip-build-ft5yzzuv/Pillow/setup.py", line 744, in <module>
    zip_safe=not debug_build(), )
  File "/usr/local/lib/python3.6/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/usr/local/lib/python3.6/distutils/dist.py", line 955, in run_commands
    self.run_command(cmd)
  File "/usr/local/lib/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/usr/local/lib/python3.6/site-packages/setuptools/command/install.py", line 61, in run
    return orig.install.run(self)
  File "/usr/local/lib/python3.6/distutils/command/install.py", line 545, in run
    self.run_command('build')
  File "/usr/local/lib/python3.6/distutils/cmd.py", line 313, in run_command
    self.distribution.run_command(command)
  File "/usr/local/lib/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/usr/local/lib/python3.6/distutils/command/build.py", line 135, in run
    self.run_command(cmd_name)
  File "/usr/local/lib/python3.6/distutils/cmd.py", line 313, in run_command
    self.distribution.run_command(command)
  File "/usr/local/lib/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/usr/local/lib/python3.6/distutils/command/build_ext.py", line 339, in run
    self.build_extensions()
  File "/tmp/pip-build-ft5yzzuv/Pillow/setup.py", line 545, in build_extensions
    raise RequiredDependencyException(f)
__main__.RequiredDependencyException: jpeg

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/tmp/pip-build-ft5yzzuv/Pillow/setup.py", line 756, in <module>
    raise RequiredDependencyException(msg)
__main__.RequiredDependencyException:

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

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

I went through the requirements on https://pillow.readthedocs.io/en/latest/installation.html and tried to find the corresponding packages for Alpine, although one I couldn't find was libimagequant, so this might be the 'culprit'. Nonetheless, it the traceback and error message seem to be saying that jpeg is missing, whereas I have installed openjpeg.

How can I modify the Dockerfile so that pip install Pillow runs?

Solution

In a comment that appears to have been deleted later, someone pointed me to https://github.com/python-pillow/Pillow/blob/c05099f45c0d94a2a98c3609a96bdb6cf7446627/depends/alpine_Dockerfile. Based on that Dockerfile I modified my own as follows:

FROM python:alpine
RUN apk --update add libxml2-dev libxslt-dev libffi-dev gcc musl-dev libgcc openssl-dev curl
RUN apk add jpeg-dev zlib-dev freetype-dev lcms2-dev openjpeg-dev tiff-dev tk-dev tcl-dev
RUN pip install Pillow

Now it builds successfully.