better handling of environment variables, and set more of them
-rw-r--r-- 6 .gitignore
-rw-r--r-- 4742 build_system.py
-rw-r--r-- 1329 mass-build.conf.kde.sample
-rwxr-xr-x 5654 mass_build.py
-rw-r--r-- 2522 vcs.py