Finally I have solved the compile issues of acerhk.
Solution - Makefile changes:
1) turn 'CFLAGS=' to 'EXTRA_CFLAGS='
2) add 'V ?= 0'
3) add the following to the acerhk.ko compile line:
That means that for the latest version of fsca16xx.sh, when pressing the wireless button, the Activate/De-Activate notifications work again (been broken for a little less then a year).
I also published it on launchpad: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/53953/comments/25