Appropriate way to handle deprecated `adminmedia` templatetag and {% admin_media_prefix %}
Since Django 1.3 you can use django.contrib.staticfiles app.
Make sure that django.contrib.staticfiles is included in your INSTALLED_APPS and the STATIC_ROOT and STATIC_URL options are specified in your settings.py.
Then run manage.py collectstatic command and all applications' static files will be collected in STATIC_ROOT folder.
In the templates you can use the {{ STATIC_URL }} context variable (make sure that django.core.context_processors.static is included in TEMPLATE_CONTEXT_PROCESSORS) or the {% static %} template tag.
<link href="{{ STATIC_URL }}admin/css/login.css" rel="stylesheet">or
{% load staticfiles %}<link href="{% static 'admin/css/login.css' %}" rel="stylesheet">
I just copied what's in base.css:
{% load admin_static %}and then
<link href="{% static 'admin/css/base.css' %}" rel="stylesheet">(replace base.css with whatever you need, like login.css in your case)
Make sure you have django.contrib.staticfiles in your INSTALLED_APPS.
(I didn't need to configure STATIC_ROOT and run manage.py collectstatic as suggested previously by Anton)