Installing SCCP

Hi,
I have a Cisco 7940 (SIP firmware) and I have attached a Cisco 7914 Expansion Module to it but I get steady red light.
After googling, It seems that 7914 wont work with SIP... how can I use this expansion module? if I install SCCP firmware on the phone will that work?
I also tried to install SCCP on FreePBX 2.5.1.0 and I get:
Include directory '/usr/include/asterisk' does not exist
make: *** [.config] Error 1
I checked the modules folder in Asterisk and I see that chan_skinny.so is alread there.. so does this means that SCCP is currently installed?
where are the asterisk headers? do I need to install additional package?
Thanks
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chan_sccp2
check it out here - http://www.voip-info.org/wiki/view/chan_sccp2
Let everyone know how you get on.
I did follow that link I
I did follow that link
I don't know where the Asterisk headers are, make I run "make" I get this:
Include directory '/usr/include/asterisk' does not exist
make: *** [.config] Error 1
thanks