I tried:

% pkg_chk -a
make: "mk/mk/bsd.prefs.mk" line 526: warning: Couldn't read shell's 
output for "cd /usr/pkgsrc && "
make: "mk/mk/bsd.prefs.mk" line 546: warning: Couldn't read shell's 
output for "cd /usr/pkgsrc && "
make: "mk/mk/bsd.prefs.mk" line 580: Could not find 
/mk/wrapper/wrapper-defs.mk
make: Fatal errors encountered -- cannot continue
eval:  make: stopped in /usr/pkgsrc: not found

pkgsrc is from NetBSD-current/tar_files and the rest is from the i386 
2.0.2 iso image.
what is wrong?
manually issued make from pkgsrc tree still works.