Building a smaller android for Arndale Board

Hello,

I would like to build a smaller version of android by excluding some built in apps and some external programs (inside .../external/...). I could exclude the apps by modifying - .../build/target/product/sdk.mk and .../build/target/product/generic_no_telephony.mk files. Build was successful for Arndale board using Linaro Android 14.03 replica build and it reduces system.tar.bz2 size by about 15MB.

But I can't seem to find any document or reference on the web on how I can exclude building some programs in 'external' directory. Which makefiles do I need to modify for this? What's the process?

-- Thanks, -Meraj