problem building seamonkey-2.1b1

[Marat N.Afanasyev]

I'm trying to build seamonkey 2.1b1, but I have the following problem:

tier_platform: ./../directory/c-sdk xpcom modules/libreg modules/libpref 
intl netwerk  extensions/auth jpeg gfx/qcms js/src/xpconnect 
intl/chardet  widget/src/gtkxtbin modules/libjar db  extensions/cookie 
extensions/permissions  storage rdf media/libvorbis  media/libnestegg 
media/libvpx  media/libogg media/libtheora  media/libsydneyaudio 
uriloader modules/libimg caps parser gfx modules/libpr0n modules/plugin 
dom view widget content editor layout docshell webshell embedding 
xpfe/appshell  extensions/universalchardet accessible profile 
xpfe/components widget/src/xremoteclient extensions/spellcheck toolkit 
security/manager extensions/pref embedding/browser/gtk startupcache 
./../mozilla/xpfe/components/autocomplete ./../directory/xpcom 
./../mailnews/base ./../mailnews/mime/public ./../mailnews 
./../suite/components  toolkit/library xpcom/stub toolkit/system/gnome 
toolkit/system/dbus
gmake[3]: Entering directory 
`/usr/home/tmp/usr/ports/local/seamonkey2-devel/work/comm-central/directory/c-sdk'
Makefile:42: config/autoconf.mk: No such file or directory
../../config/config.mk:57: /config/autoconf.mk: No such file or directory
Makefile:55: *** target file `depend' has both : and :: entries.  Stop.
gmake[3]: Leaving directory 
`/usr/home/tmp/usr/ports/local/seamonkey2-devel/work/comm-central/directory/c-sdk'
gmake[2]: *** [tier_platform] Error 2
gmake[2]: Leaving directory 
`/usr/home/tmp/usr/ports/local/seamonkey2-devel/work/comm-central/mozilla'
gmake[1]: *** [default] Error 2
gmake[1]: Leaving directory 
`/usr/home/tmp/usr/ports/local/seamonkey2-devel/work/comm-central/mozilla'
gmake: *** [default] Error 2
*** Error code 1

in 
/usr/home/tmp/usr/ports/local/seamonkey2-devel/work/comm-central/directory/c-sdk 
autoconf.mk.in exists, but autoconf.mk does not. is there correct way to 
create this file?

# uname -a
FreeBSD xxx.xxx.xx 8.1-STABLE FreeBSD 8.1-STABLE #3: Sat Jul 24 15:48:00 
MSD 2010     root at xxx.xxx.xx:/usr/obj/usr/src/sys/ZEALOT  amd64

-- 
SY, Marat