=> Bootstrap dependency digest>=20010302: found digest-20121220
=> Checksum SHA1 OK for yabasic-2.763.tar.gz
=> Checksum RMD160 OK for yabasic-2.763.tar.gz
===> Installing dependencies for yabasic-2.763
=> Build dependency x11-links>=0.72: found x11-links-0.74
=> Full dependency ncurses>=5.4nb1: found ncurses-5.9
===> Overriding tools for yabasic-2.763
===> Extracting for yabasic-2.763
===> Patching for yabasic-2.763
=> Applying pkgsrc patches for yabasic-2.763
===> Creating toolchain wrappers for yabasic-2.763
ERROR: zlib>=1.1.4nb1 is not installed; can't buildlink files.
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/lang/yabasic
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/lang/yabasic