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A bit late to the party as it's been floating around for ages.. The past few months I have been tinkering with the Xbox tree seeing how it works.. and much like my work with the NT 5 tree, Environment Variables will totally change a build. I'm making this thread to list down what environment variables I know (most will already know this), as a reference for me and anyone interested.. Also citation on errors or misinformation is greatly welcomed, I won't be putting the standard "_NT386TREE" kind of ones.. Anything with a * I am unsure about.. These are related to targeting "Retail" and trigger quite a few changes during build. • RETAILXM3=1 • OFFICIAL_BUILD=1 * or • RETAILXM3P=1 • OFFICIAL_BUILD=1 * This one caused a load of errors, I didnt look much into this one yet. • COVERAGE_BUILD=1 * For some reason this one was never set for the tree I work with, some postbuild scripts require this. • _BUILDVER=4400 This one seems to affect more 'closer to production' build options, several postbuild scripts rely on this set. • COMPUTERNAME=XBuilds This one needs to be set before razzle gets to "ntuser.cmd" as it specifies build options. • NTDEBUG=release Causes: • 'ltcg ~dm' to be added to %BUILD_OPTIONS% • sets NTDEBUG=ntsdnodbg • sets NODEVKIT=1 But setting to: • NTDEBUG=free Causes: • 'ltcg profile' to be added to %BUILD_OPTIONS% • NODEVKIT=1 These are related to Checked builds. • BUILD_ALT_DIR=d • CHECKED_ALT_DIR= * • FREEBUILD=0 * This one is presumably set on retail builds • FREEBUILD=0 * This one in theory enables some alternative textures and model placements for the dashboard, most likely used during testing. • COOL_DASH=1 * This one I am unsure about its purpose, it's referenced throughout the code.. • SILVER= I will add more as I find them, if anyone else knows any worth noting please add!