[asterisk-users] Installing Asterisk v1.6 on Ubuntu Intrepid?

[Christian]

Hi all,
I am trying to isntall the v1.6 version of Asterisk on my Intrepid 
system, but I get an error after I have typed make:
[CC] manager.c -> manager.o
manager.c: In function ‘action_getvar’:
manager.c:1732: error: ‘SENTINEL’ undeclared (first use in this function)
manager.c:1732: error: (Each undeclared identifier is reported only once
manager.c:1732: error: for each function it appears in.)
make[1]: *** [manager.o] Error 1
make: *** [main] Error 2

Any thoughts?
Best regards and thanks,
Christian