If you have this problem when you update your FreeBSD Ports:

===>>> Launching child to update ruby19-iconv-1.9.3.547,1 to ruby20-iconv-2.0.0.576,1

===>>> All >> ruby19-iconv-1.9.3.547,1 (17/17)

===>>> Currently installed version: ruby19-iconv-1.9.3.547,1
===>>> Port directory: /usr/ports/converters/ruby-iconv

	===>>> This port is marked IGNORE
	===>>> Not needed with Ruby 2.0 or newer


	===>>> If you are sure you can build it, remove the
	       IGNORE line in the Makefile and try again.

===>>> Update for ruby19-iconv-1.9.3.547,1 failed
===>>> Aborting update

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You have to set RUBY_VER=1.9 in /etc/make.conf because the FreeBSD Ports didn't know what ruby version you use...