=> Bootstrap dependency digest>=20010302: found digest-20121220
=> Checksum SHA1 OK for libXt-1.1.3.tar.bz2
=> Checksum RMD160 OK for libXt-1.1.3.tar.bz2
===> Installing dependencies for libXt-1.1.3
=> Tool dependency libtool-base>=2.2.6bnb3: found libtool-base-2.4.2nb1
=> Tool dependency pkg-config>=0.25: found pkg-config-0.28
=> Build dependency x11-links>=0.72: found x11-links-0.74
===> Overriding tools for libXt-1.1.3
===> Extracting for libXt-1.1.3
===> Patching for libXt-1.1.3
===> Creating toolchain wrappers for libXt-1.1.3
ERROR: zlib>=1.1.4nb1 is not installed; can't buildlink files.
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/x11/libXt
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/x11/libXt