Problem compile asterisk 1.4 on kernel 2.6.14

I have use asterisk 1.2 and now I want to upgrade to asterisk 1.4. The system on current working is on linux slackware with kernel 2.6.14 without any problem.

When I have start compile asterisk 1.4 stop after this problem:

[CC] chan_phone.c -> chan_phone.o
In file included from chan_phone.c:51:
/usr/include/linux/ixjuser.h:351: error: syntax error before ‘*’ token
make[1]: *** [chan_phone.o] Error 1
make: *** [channels] Error 2