===> ruby-2.1.6,1 depends on package: libffi>=0 - found
===> ruby-2.1.6,1 depends on package: libedit>=0 - found
===> ruby-2.1.6,1 depends on file: /usr/local/bin/autoconf-2.69 - found
===> ruby-2.1.6,1 depends on shared library: libyaml.so - not found
===> Verifying for libyaml.so in /usr/ports/textproc/libyaml
===> Installing for libyaml-0.1.6_2
===> Checking if libyaml already installed
===> libyaml-0.1.6_2 is already installed
You may wish to ``make deinstall'' and install this port again
by ``make reinstall'' to upgrade it properly.
If you really wish to overwrite the old port of libyaml
without deleting it first, set the variable "FORCE_PKG_REGISTER"
in your environment or the "make install" command line.
*** [check-already-installed] Error code 1
Stop in /usr/ports/textproc/libyaml.
*** [lib-depends] Error code 1
Stop in /usr/ports/lang/ruby21.
*** [build] Error code 1
Stop in /usr/ports/lang/ruby21.
===>>> make build failed for lang/ruby21
===>>> Aborting update
===>>> Update for ruby-2.1.5_4,1 failed
===>>> Aborting update