'NO_PSE_HACK' is defined in 'opt_cpu.h':
http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/conf/options.i386.diff?r1=1.132.2.19&r2=1.132.2.20
but src/sys/i386/i386/pmap.c doesn't include it. You need to add
'opt_cpu.h' in the file to make this work.
Just FYI...
Jung-uk Kim