From 1a942f1bb1596ccee9ba109eb10205eb9537c2e6 Mon Sep 17 00:00:00 2001
From: David Neto <dneto@google.com>
Date: Wed, 13 Jan 2021 14:02:26 -0500
Subject: [PATCH] Update README for GL/glx.h dependency on Linux

(cherry picked from commit 4260ae4481ab13888606eb8e1ebdeb3391691a57)

Change-Id: I77edfe92d9687d92748004be948e456ed8c8d613
---
 external/vulkancts/README.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/external/vulkancts/README.md b/external/vulkancts/README.md
index 2bf4245c6..2bdf84b0c 100644
--- a/external/vulkancts/README.md
+++ b/external/vulkancts/README.md
@@ -25,6 +25,9 @@ The following tools must be installed and present in the PATH variable:
 ### Linux
 
  * Standard toolchain (make, gcc/clang)
+ * If you have X11 installed, then the build assumes you also have the `GL/glx.h` header
+   file.
+    * You can get this from the `mesa-common-dev` Ubuntu package.
 
 ### Android
 
-- 
2.34.1