patch-CMakeLists.txt

--- CMakeLists.txt.orig	2020-04-15 05:06:21 UTC
+++ CMakeLists.txt
@@ -1,25 +1,13 @@
 cmake_minimum_required(VERSION 3.13)
 project(Forest)
-include(ExternalProject)
+#include(ExternalProject)
 enable_testing()
 
-set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_FLAGS -Wall)
 
-ExternalProject_Add(
-  gtest
-  PREFIX gtest
-  URL https://github.com/google/googletest/archive/release-1.10.0.tar.gz
-  URL_HASH SHA256=9dc9157a9a1551ec7a7e43daea9a694a0bb5fb8bec81235d8a1e6ef64c716dcb
-  INSTALL_COMMAND ""
-)
-
 include_directories(
   ${CMAKE_SOURCE_DIR}
-  ${CMAKE_BINARY_DIR}/gtest/src/gtest/googletest/include
-)
-link_directories(
-  ${CMAKE_BINARY_DIR}/gtest/src/gtest-build/lib
 )
 
 if (DEFINED ENV{OPENSSL_INCLUDE_DIR})