=> Bootstrap dependency digest>=20010302: found digest-20121220
=> Checksum SHA1 OK for yorick-1.6.02.tgz
=> Checksum RMD160 OK for yorick-1.6.02.tgz
===> Installing dependencies for yorick-1.6.02nb2
=> Tool dependency gmake>=3.81: found gmake-3.82nb6
=> Tool dependency gtexinfo>=3.12: found gtexinfo-4.13anb1
=> Build dependency x11-links>=0.72: found x11-links-0.74
=> Full dependency pkg_install-info-[0-9]*: found pkg_install-info-4.5nb3
===> Overriding tools for yorick-1.6.02nb2
===> Extracting for yorick-1.6.02nb2
===> Patching for yorick-1.6.02nb2
=> Applying pkgsrc patches for yorick-1.6.02nb2
for f in /usr/pkgsrc/work/math/yorick/work/yorick-1.6/ysite.sh; do				 /usr/bin/sed -e 's:@PREFIX@:/usr/pkg:g' $f > $f.tmp	 && /bin/mv $f.tmp $f;					 done
===> Creating toolchain wrappers for yorick-1.6.02nb2
ERROR: zlib>=1.1.4nb1 is not installed; can't buildlink files.
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/math/yorick
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/math/yorick