bmake; no system rules (sys.mk) - Bootstraping

[Marco <marcojasso%gmail.com@localhost>]

Hello, I'm trying to build pkgsrc on aix6 but an error happend while trying to 
build nbcompat/config.h:

config.status: creating Makefile
config.status: creating nbcompat/config.h
bmake: no system rules (sys.mk).

bmake: stopped in /usr/pkgsrc/bootstrap/work/libnbcompat
===> exited with status 2


I configured this on my system:

export PKG_DBDIR=/usr/pkg/var/db/pkg
export MAKECONF=/usr/pkg/etc/mk.conf
export MAKESYSPATH=/usr/pkg/share/mk
export CC=/usr/bin/gcc
export PATH=/usr/pkg/bin:/usr/pkg/sbin:$PATH

run bootstrap:
./bootstrap --prefix /usr/pkg --varbase /usr/pkg/var --pkgdbdir 
/usr/pkg/var/db/pk