Problem with nanobsd compilation

[Espartano]

Hi folks, I have a problem compiling nanobsd, this is the problem:

I'm compiling NanoBSD from my laptop, when the compilation finish and
I reboot the laptop I can't boot freebsd correctly anymore, the boot0
stage looks correctly since I can see the boot menu like this in my
screen:

F1 win
F2 FreeBSD
F6 pxe

Default: F2

Then when I press F2 key the characters | / - \ start to spin and
suddenly it freeze, I had to boot from live-cd and mount the FreeBSD's
partition  by hand in order to verify why FreeBSD was not be able to
boot, then I realized that /boot.config file was added to root
directory just after nanobsd compilation finished, I removed that file
and rebooted the laptop and now the boot process works perfect.

The content of the /boot.config was this:

[espartano at daemonlap ~]$ cat /boot.config
-h
[espartano at daemonlap ~]$

My question is, why NanoBSD's compilation added this file to my
laptop's root directory ?

It could be a NanoBSD bug script ?

This is my NanoBSD configuration file:

NANO_NAME=ZROUTER
NANO_KERNEL=ALIX9.0
NANO_IMAGES=1
NANO_DRIVE=ad0

# !! important for ALIX boards !!
NANO_BOOT0CFG="-o nopacket -s 1 -m 3"
NANO_PMAKE="make -j 3"

NANO_CONFSIZE=102400
NANO_RAM_TMPVARSIZE=20480
NANO_RAM_ETCSIZE=10240

#NANO_NEWFS="-b 4096 -f 512 -i 8192 -O1 -U"

FlashDevice sandisk 512mb

customize_cmd cust_install_files
customize_cmd cust_allow_ssh_root
cust_comconsole


CONF_INSTALL='
WITHOUT_BIND=YES
WITHOUT_BLUETOOTH=YES
WITHOUT_CALENDAR=YES
#WITHOUT_EXAMPLES=YES
WITHOUT_GDB=YES
WITHOUT_SENDMAIL=YES
WITHOUT_TOOLCHAIN=YES
'

CONF_WORLD='
WITHOUT_ASSERT_DEBUG=YES
#WITHOUT_BIND=YES
WITHOUT_CTM=YES
WITHOUT_CVS=YES
WITHOUT_CXX=YES
WITHOUT_DICT=YES
WITHOUT_GCOV=YES
WITHOUT_GPIB=YES
WITHOUT_HTML=YES
WITHOUT_INET6=YES
WITHOUT_INFO=YES
WITHOUT_IPFILTER=YES
WITHOUT_IPFW=YES
WITHOUT_IPX=YES
WITHOUT_LPR=YES
WITHOUT_MAIL=YES
WITHOUT_NIS=YES
WITHOUT_NLS=YES
WITHOUT_RCMDS=YES
WITHOUT_RCS=YES
WITHOUT_SENDMAIL=YES
WITHOUT_SHAREDOCS=YES
#WITHOUT_USB=YES
WITHOUT_ZFS=YES
'


Thanks a lot.