Run
Code
PROJECT=... ./scripts/clean touchscreen-image
PROJECT=... ./scripts/clean touchscreen
PROJECT=... make image 2>&1 | tee log_file
and put log_file somewhere to see what was build.
And for which project are you building? Supported projects for touchscreen addon are Generic, RPi, RPi2 and imx6 defined in PKG_ADDON_PROJECTS packages/addons/service/touchscreen/package.mk.