From 081ab00a0a45d8737f9647ac8f5e3e2f0039e189 Mon Sep 17 00:00:00 2001
From: Lee Spottiswood <me@lee.io>
Date: Mon, 7 Jan 2019 21:21:23 +0000
Subject: [PATCH] Update Dockerfile

---
 Dockerfile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Dockerfile b/Dockerfile
index 9e6831997..5df47e98a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,6 +17,7 @@ RUN set -x \
         libtool \
         make \
         nasm \
+        libpng-dev \
     && npm install --production \
     && apk del .build-dependencies