Basic steps to build:

1 - Get local copy of CM7 respository 2 - Get copy of the device tree into device/htc/heroc 3 - Copy modified files from 'device/htc/heroc/buildmods' to proper directories: a) definitions.mk into 'build/core' (Temporary fix for boot.img size issue) b) vendorsetup.sh into 'vendor/cyanogen' (Add lunch combo) c) prelink-linux-arm-heroc.map into 'vendor/cyanogen' (Map library locations) d) AndroidProducts.mk into 'vendor/cyanogen/products' (Add cyanogen_heroc product) e) cyanogen_heroc.mk into 'vendor/cyanogen/products' (Add cyanogen_heroc makefile) 4 - Run get-rommanager in vendor/cyanogen directory 5 - Get proprietary files into 'vendor/htc/heroc/proprietary' a) Put ROM (update.zip) in repo root and run 'unzip-files.sh' from the 'device/htc/heroc' directory b) Use 'adb' to pull files from usb connected device by running 'extract-files.sh' c) Copy files from expanded system directory on your local machine by running 'copy-files.sh' d) Copy files from 'device/htc/heroc/proprietary' directory (also needs 'setup-makefiles.sh') 6 - Setup build environment by sourcing envsetup file '. build/envsetup.sh' 7 - Run Lunch to select the build target 'lunch cyanogen_heroc-eng' 8 - Build the system with make, mka, etc.