From 56333073a98fb04f58bbcd27c1f023b138dd8019 Mon Sep 17 00:00:00 2001
From: Yeongjin Jeong <yeongjin.jeong@navercorp.com>
Date: Fri, 1 Nov 2019 14:22:46 +0900
Subject: [PATCH] vulkan: Fix build error when gstvulkan is not installed

The following build error occurs:

vkdeviceprovider.h:30:10: fatal error: gst/vulkan/vulkan.h: No such file or directory
  #include <gst/vulkan/vulkan.h>
           ^~~~~~~~~~~~~~~~~~~~~
---
 ext/vulkan/meson.build | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/ext/vulkan/meson.build b/ext/vulkan/meson.build
index 63e130396b..933688b3a2 100644
--- a/ext/vulkan/meson.build
+++ b/ext/vulkan/meson.build
@@ -1,6 +1,15 @@
 if get_option('vulkan').disabled()
   subdir_done()
 endif
+
+if not gstvulkan_dep.found()
+  if get_option('vulkan').enabled()
+    error('GStreamer Vulkan plugin required via options, but needed dependencies not found.')
+  else
+    subdir_done()
+  endif
+endif
+
 glslc = find_program('glslc', required: get_option('vulkan'))
 if not glslc.found()
   subdir_done()