"No DATAMODEL_NATIVE specified"

[Ely Mansour <elynt at exchange dot ml dot com>]

I am trying to compile jitterbug and I get this error
message. Can you help ?

gcc -g -O2   -c jitterbug.c -o jitterbug.o
In file included from /usr/include/sys/turnstile.h:12,
                 from /usr/include/sys/t_lock.h:20,
                 from /usr/include/sys/vnode.h:37,
                 from /usr/include/sys/stream.h:21,
                 from /usr/include/netinet/in.h:38,
                 from includes.h:125,
                 from jitterbug.h:23,
                 from jitterbug.c:28:
/devtools/sun5/gnu/lib/gcc-lib/sparc-sun-solaris2.5.1/2.7.2.1/include/sys/param.h:187:
warning: `NBBY' redefined
/usr/include/sys/select.h:45: warning: this is the location of the
previous definition
In file included from /usr/include/sys/stream.h:26,
                 from /usr/include/netinet/in.h:38,
                 from includes.h:125,
                 from jitterbug.h:23,
                 from jitterbug.c:28:
/usr/include/sys/model.h:32: #error "No DATAMODEL_NATIVE specified"
gmake: *** [jitterbug.o] Error 1