=> Bootstrap dependency digest>=20010302: found digest-20121220
=> Checksum SHA1 OK for icbm3d.0.4.tar.gz
=> Checksum RMD160 OK for icbm3d.0.4.tar.gz
===> Installing dependencies for icbm3d-0.4nb1
=> Build dependency x11-links>=0.72: found x11-links-0.74
===> Overriding tools for icbm3d-0.4nb1
===> Extracting for icbm3d-0.4nb1
===> Patching for icbm3d-0.4nb1
=> Applying pkgsrc patches for icbm3d-0.4nb1
===> Creating toolchain wrappers for icbm3d-0.4nb1
ERROR: zlib>=1.1.4nb1 is not installed; can't buildlink files.
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/games/icbm3d
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/games/icbm3d