=> Bootstrap dependency digest>=20010302: found digest-20121220
=> Checksum SHA1 OK for coolmail-1.3.tgz
=> Checksum RMD160 OK for coolmail-1.3.tgz
===> Installing dependencies for coolmail-1.3nb3
=> Build dependency x11-links>=0.72: found x11-links-0.74
===> Overriding tools for coolmail-1.3nb3
===> Extracting for coolmail-1.3nb3
===> Patching for coolmail-1.3nb3
=> Applying pkgsrc patches for coolmail-1.3nb3
===> Creating toolchain wrappers for coolmail-1.3nb3
ERROR: zlib>=1.1.4nb1 is not installed; can't buildlink files.
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/mail/coolmail
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/mail/coolmail