My practice is kind of ill-behavior. pkgsrc directory is not always updated, old one and new ones are mixed. I know it is the fundamental reason why I am getting strange problem. Today I've got following while doing 'sudo make package at shells/zsh-current':

../lib/libinstall.a(pkg_io.o): In function `find_best_package_int':
pkg_io.c:(.text+0x1a7): undefined reference to `fetchInitURLList'
pkg_io.c:(.text+0x254): undefined reference to `fetchUnquoteFilename'
pkg_io.c:(.text+0x26a): undefined reference to `fetchFreeURLList'
pkg_io.c:(.text+0x292): undefined reference to `fetchFreeURLList'
pkg_io.c:(.text+0x2ac): undefined reference to `fetchUnquoteFilename'
pkg_io.c:(.text+0x2e6): undefined reference to `fetchStringifyURL'
*** Error code 1

The raw log of what I did:

   119  16:39   cd ../shells/zsh-current/
   120  16:39   make
   121  16:39   ls -lag work/
   122  16:39   rm work/.build_done
   123  16:40   sudo rm work/.build_done
   124  16:40   make
   125  16:40   unsetenv PKG_PATH
   126  16:40   make
   130  16:41   sudo make package
   131  16:43   sudo pkg_delete -f pkg_install
   132  16:44   sudo pkg_delete -ff pkg_install
   133  16:44   sudo make package
   134  16:45   ( cd ../../pkgtools/ ; cvs update -dPA )
   135  16:45   sudo make package
   136  16:46   ( cd ../../security ; cvs update -dPA )
   137  16:51   sudo make package
   139  16:53   ( cd ../../pkgtools/pkg_install ; sudo make clean && sudo make package )
   140  17:06   pkg_info | grep libfetch
   141  17:06   ( cd ../../net/libfetch/ ; sudo make package )
   142  17:09   ( cd ../../net/libfetch/ ; cvs update -dPA )
   143  17:10   ( cd ../../net/libfetch/ ; sudo make package )
   145  17:11   sudo pkg_delete -ff pkg_install
   146  17:11   ( cd ../../net/libfetch/ ; sudo make package )
   147  17:13   sudo vi /etc/mk.conf
                adding 
                'SKIP_LICENSE_CHECK=yes' line
   148  17:13   ( cd ../../net/libfetch/ ; sudo make package )
console:makoto@u4 17:17:45/091201(...shells/zsh-current)> 

It is now cleared. Then I am getting:

make: don't know how to make /export/pkgsrc/shells/zsh-current/PLIST.shlibs. Stop

You need to cvs update (-dPA) on shells/zsh also. zsh-current depends shells/zsh directory.