I've been looking through the Guide. The specific problem I have 
actually has to do with PKG_CONFIG_PATH. I'm trying to build 
/meta-pkgs/gnome. This ends very early in error, because it's unable to 
find glib-2.0 and gives the advise to add the directory it is in to 
PKG_CONFIG_PATH. I did this with export, but it still can't find it. So 
I'm thinking about adding it to .profile, hoping it solves the problem.

Thank you for helping out.