pkg_comp and pkg_chk

[Stefano Marinelli <postnet%dragas.dyndns.org@localhost>]

Hello everybody. Trying to compile packages using pkg_chk inside a pkg_comp 
chroot.
I generate a list of packages using the pkg_chk -g and copy it into the chroot.
Then launch "pkg_chk -au -C namefile.conf" and it starts building. After some 
minutes, it stops with something like that:

ERROR: [depends.mk] A package matching ``gmake>=3.81'' should
ERROR:     be installed, but one cannot be found.  Perhaps there is a
ERROR:     stale work directory for ../../devel/gmake?
*** Error code 1

Actually it built gmake but didn't install it. Same happens with other packages 
(and other dependancies). Am I doing
anything wrong? I was following this: 
http://wiki.netbsd.org/tutorials/pkgsrc/pkg_comp_pkg_chk/

Thank you,
Stefano