using modified app_changrab from http://www.netdomination.org/~stkn/stuff/app_changrab.c

Command Line:  gcc `asterisk-config --cflags` `asterisk-config --solink` -o app_changrab.so app_changrab.c

Error:

app_changrab.c: In function `changrab_exec':
app_changrab.c:106: warning: implicit declaration of function `ast_channel_alloc'
app_changrab.c:106: warning: assignment makes pointer from integer without a cast
app_changrab.c: In function `originate':
app_changrab.c:246: error: too many arguments to function `ast_pbx_outgoing_exten'