h2(#fromsource). Option 2: Install from source
+Install prerequisites for Debian 7 or 8:
+
+<notextile>
+<pre><code><span class="userinput">sudo apt-get install \
+ bison build-essential gettext libcurl3 libcurl3-gnutls \
+ libcurl4-openssl-dev libpcre3-dev libreadline-dev \
+ libssl-dev libxslt1.1 zlib1g-dev
+</span></code></pre></notextile>
+
+Install prerequisites for CentOS 6:
+
+<notextile>
+<pre><code><span class="userinput">sudo yum install \
+ libyaml-devel glibc-headers autoconf gcc-c++ glibc-devel \
+ patch readline-devel zlib-devel libffi-devel openssl-devel \
+ automake libtool bison sqlite-devel
+</span></code></pre></notextile>
+
+Install prerequisites for Ubuntu 12.04:
+
+<notextile>
+<pre><code><span class="userinput">sudo apt-get install \
+ gawk g++ gcc make libc6-dev libreadline6-dev zlib1g-dev libssl-dev \
+ libyaml-dev libsqlite3-dev sqlite3 autoconf libgdbm-dev \
+ libncurses5-dev automake libtool bison pkg-config libffi-dev
+</span></code></pre></notextile>
+
+Build and install Ruby:
+
<notextile>
<pre><code><span class="userinput">mkdir -p ~/src
cd ~/src