I noticed the libreadline-dev package is listed twice here.
$ sudo apt-get install -y autoconf \
bison \
build-essential \
curl \
g++ \
gcc \
git \
libffi-dev \
libgconf-2-4 \
libgdbm-dev \
libncurses5-dev \
libreadline-dev \
libreadline-dev \
libsqlite3-dev \
libssl-dev \
libxi6 \
libyaml-dev \
make \
sqlite3 \
xvfb \
zip \
zlib1g-dev