From 3703ef88ff1693310c1ca159f411a9d4ebe52dda Mon Sep 17 00:00:00 2001
From: Adam Sawicki <adam.sawicki@amd.com>
Date: Tue, 29 Nov 2022 16:06:36 +0100
Subject: [PATCH] Fixing CMakeLists.txt for older Cmake

See #303
---
 CMakeLists.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a1397dc..df35846 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,6 +2,9 @@ cmake_minimum_required(VERSION 3.9)
 
 project(VulkanMemoryAllocator)
 
+# https://cmake.org/cmake/help/latest/variable/PROJECT_IS_TOP_LEVEL.html
+string(COMPARE EQUAL ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_SOURCE_DIR} PROJECT_IS_TOP_LEVEL)
+
 if(PROJECT_IS_TOP_LEVEL)
     find_package(Vulkan REQUIRED)
 endif()