The install instructions tell on: ​http://mediagoblin.readthedocs.org/en/v0.6.1/siteadmin/deploying.html

Tell me to install the prerequisite python-imaging on Fedora. But in the version I'm using (Fedora 20), this package has been replaced by

python-pillow

https://fedoraproject.org/wiki/Features/Pillow
Replace PIL (python-imaging) with Pillow, an actively maintained fork which is also heading for python3 compatibility

When trying to install with:

./experimental-bootstrap.sh && ./configure && make

I get:

checking for Python 'Image' library... no
configure: error: Python Imaging Library is required

./configure --with-python3 fails when python3.4 is the installed version of python3.

(mediagoblin-0.8.0-dev) ~/mediagoblin $ python --version
Python 3.4.3
(mediagoblin-0.8.0-dev) ~/mediagoblin $ ./configure --with-python3
checking for python3.3... no
configure: error: in `/srv/mediagoblin/mediagoblin':
configure: error: --with-python3 given but no acceptable python3 (3.3) could be found
See `config.log' for more details

I'm going to set a milestone of 0.9.0 on here because of ticket #5017.

Plugins also want to be able to specify defaults and do type checking for their own section. We should allow this.

In theory, this involves that the user's config file must have a "short reading" first to determine what plugins are actually being loaded before we extent the config specification.