From 0e2804fbf243f38da0f13435d2b3426e3aa21974 Mon Sep 17 00:00:00 2001
From: Matthew Butterick <mbutterick@users.noreply.github.com>
Date: Mon, 10 Oct 2016 11:06:38 -0700
Subject: [PATCH] Update .travis.yml

---
 .travis.yml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/.travis.yml b/.travis.yml
index 2373c62..69528a0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,12 @@
 language: c
 sudo: false
 
+addons:
+  apt:
+    packages:
+    # for testing racket/gui/base
+    - libgtk-3-dev
+
 env:
   global:
     - RACKET_DIR=~/racket