>/usr/include/sys/model.h:32: #error "No DATAMODEL_NATIVE
>specified"

Your gcc version doesn't match the OS version.

<http://www.unixguide.net/sun/faq/6.28.shtml>

"As with all new Solaris releases, you need to reinstall 
gcc after upgrading, unless your are running gcc 2.8.0 or 
later. "