=> Bootstrap dependency digest>=20010302: found digest-20121220
=> Checksum SHA1 OK for cgoban-1.9.14.tar.gz
=> Checksum RMD160 OK for cgoban-1.9.14.tar.gz
===> Installing dependencies for cgoban-1.9.14
=> Build dependency x11-links>=0.72: found x11-links-0.74
===> Overriding tools for cgoban-1.9.14
===> Extracting for cgoban-1.9.14
===> Patching for cgoban-1.9.14
=> Applying pkgsrc patches for cgoban-1.9.14
===> Creating toolchain wrappers for cgoban-1.9.14
ERROR: zlib>=1.1.4nb1 is not installed; can't buildlink files.
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/games/cgoban
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/games/cgoban