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diff --git a/doc/install/installation.md b/doc/install/installation.md
index e335fc99fbf..b14cb2d44c4 100644
--- a/doc/install/installation.md
+++ b/doc/install/installation.md
@@ -66,6 +66,9 @@ Install the required packages (needed to compile Ruby and native extensions to R
sudo apt-get install -y build-essential zlib1g-dev libyaml-dev libssl-dev libgdbm-dev libre2-dev libreadline-dev libncurses5-dev libffi-dev curl openssh-server checkinstall libxml2-dev libxslt-dev libcurl4-openssl-dev libicu-dev logrotate python-docutils pkg-config cmake
+Ubuntu 14.04 (Trusty Tahr) doesn't have the `libre2-dev` package available, but
+you can [install re2 manually](https://github.com/google/re2/wiki/Install).
+
If you want to use Kerberos for user authentication, then install libkrb5-dev:
sudo apt-get install libkrb5-dev