From 7768667dc0a13caf771f229a9c079454a724bdc9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20=C4=8Cert=C3=ADk?= <ondrej@certik.us>
Date: Mon, 18 Nov 2019 12:03:09 -0700
Subject: [PATCH] Install GL/gl.h

---
 .travis.yml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/.travis.yml b/.travis.yml
index 32eea85706..f4573dc8e9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -58,8 +58,16 @@ matrix:
       os: osx
     - compiler: clang
       os: linux
+      addons:
+        apt:
+          packages:
+            - libglu1-mesa-dev
     - compiler: gcc
       os: linux
+      addons:
+        apt:
+          packages:
+            - libglu1-mesa-dev
 
 install:
   - source ci/install_travis.sh