"make test" results in error "ValueError: jpeg is required unless explicitly disabled using --disable-jpeg, aborting"

[nathanperkins]

I had this problem and saw it in a thread on Simian-discuss.

Issue
Pillow added a dependency on a "jpeg" package that has to be installed with brew. This dependency should be integrated into the install or appropriate instructions should be added to the setup instructions.

How to replicate

1. Follow the install instructions on a fresh copy of El Capitan up to the make test portion.
2. Attempt to run make test, it will fail with error ValueError: jpeg is required unless explicitly disabled using --disable-jpeg, aborting
3. Install the jpeg package using brew.
4. Rerun make test, it will work.

[Mahdi-GoVanguard]

Same issue, thanks Nathan for the assist.