8325731: Installation instructions for Debian/Ubuntu don't mention autoconf

Backport-of: c3c1cdd1b017654469f214c62457cde248474f2f

Author: parttimenerd

doc/building.html

@@ -476,7 +476,7 @@ <h3 id="linux">Linux</h3>
 <p>The basic tooling is provided as part of the core operating system,
 but you will most likely need to install developer packages.</p>
 <p>For apt-based distributions (Debian, Ubuntu, etc), try this:</p>
-<pre><code>sudo apt-get install build-essential</code></pre>
+<pre><code>sudo apt-get install build-essential autoconf</code></pre>
 <p>For rpm-based distributions (Fedora, Red Hat, etc), try this:</p>
 <pre><code>sudo yum groupinstall &quot;Development Tools&quot;</code></pre>
 <p>For Alpine Linux, aside from basic tooling, install the GNU versions

doc/building.md

@@ -289,7 +289,7 @@ will most likely need to install developer packages.
 
 For apt-based distributions (Debian, Ubuntu, etc), try this:
 ```
-sudo apt-get install build-essential
+sudo apt-get install build-essential autoconf
 ```
 
 For rpm-based distributions (Fedora, Red Hat, etc), try this: