Makefile for pelican with multiple outputs and one single settings file.

Makefile

generate_site:
  SITENAME="site" PATH=sitesrc SITEURL="http://siteurl" pelican -s settings.py output_site
generate_blog:
  SITENAME="blog" PATH=blogsrc SITEURL="http://blogurl" pelican -s settings.py output_blog
html: generate_blog generate_site
  @echo "done!"

settings.py

import os

SITENAME = os.environ['SITENAME']
PATH = os.environ['PATH']
SITEURL = os.environ['SITEURL']