From f63dd5c9d874310c8403f3aef9302b761efedd18 Mon Sep 17 00:00:00 2001
From: Ethan Lee <flibitijibibo@gmail.com>
Date: Thu, 14 Nov 2019 20:02:12 -0500
Subject: [PATCH] GN: Make PLATFORM_XCB optional, based on a user-defined
 variable.

Not all Linux platforms will have X11 available (Wayland, GGP), so we have to
declare a variable that checks use_x11 separately.
---
 BUILD.gn | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/BUILD.gn b/BUILD.gn
index 79d186f..67b9cf6 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -13,13 +13,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import("//build_overrides/vulkan_headers.gni")
+
 config("vulkan_headers_config") {
   include_dirs = [ "include" ]
 
   if (is_win) {
     defines = [ "VK_USE_PLATFORM_WIN32_KHR" ]
   }
-  if (is_linux) {
+  if (defined(vulkan_use_x11) && vulkan_use_x11) {
     defines = [ "VK_USE_PLATFORM_XCB_KHR" ]
   }
   if (is_android) {