Can't install: missing libiconv on Ubuntu 14.04/Bitnami stack

[Mike Mitchell]

Ho, I'm a newbie to ruby but not to linux. I'm really stuck on install, please help.

gem install nokogiri -v '1.6.4.1'

Log:
  

  /opt/bitnami/rvm/rubies/ruby-2.1.2/bin/ruby extconf.rb
checking if the C compiler accepts  -I/opt/bitnami/sqlite/include -I/opt/bitnami/varnish/include -I/opt/bitnami/mysql/include -I/opt/bitnami/postgresql/include -I/opt/bitnami/apache2/include -I/opt/bitnami/subversion/include -I/opt/bitnami/common/include... yes
Building nokogiri using packaged libraries.
checking for iconv... no
-----
libiconv is missing.

There are 2 installed:
/usr/include/iconv.h
/opt/bitnami/common/include/iconv.h

zlib1g-dev is also installed.

Tried:

gem install nokogiri -v '1.6.4.1' -- --with-iconv-lib=/usr/lib --with-iconv-include=/usr/include

gem install nokogiri -v '1.6.4.1' -- --use-system-libraries

Thoughts?