rvm pkg install iconv
rvm pkg install readline
rvm install 1.9.2 --enable-shared --with-readline-dir=/usr/local/Cellar/readline/6.2.1 --with-iconv-dir=$rvm_path/usr
CONFIGURE_OPTS="--enable-shared --with-readline-dir=/usr/local/Cellar/readline/6.2.1/ --with-iconv-dir=/usr/local/Cellar/libiconv/1.14" rbenv install 1.9.2-p290