=> Bootstrap dependency digest>=20010302: found digest-20121220
=> Checksum SHA1 OK for libXScrnSaver-1.2.2.tar.bz2
=> Checksum RMD160 OK for libXScrnSaver-1.2.2.tar.bz2
===> Installing dependencies for libXScrnSaver-1.2.2
=> 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
=> Build dependency scrnsaverproto>=1.2.0: found scrnsaverproto-1.2.2
===> Overriding tools for libXScrnSaver-1.2.2
===> Extracting for libXScrnSaver-1.2.2
===> Patching for libXScrnSaver-1.2.2
===> Creating toolchain wrappers for libXScrnSaver-1.2.2
ERROR: zlib>=1.1.4nb1 is not installed; can't buildlink files.
*** Error code 1

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

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