From 151d51ef098ddfa5bf7c255ca5387bb73d0f770b Mon Sep 17 00:00:00 2001
From: Sam Edwards <CFSworks@gmail.com>
Date: Sun, 12 Jan 2020 12:02:22 -0700
Subject: [PATCH] CMake: Autodetect THIRDPARTY_DIRECTORY when in source root

---
 dtool/Package.cmake | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/dtool/Package.cmake b/dtool/Package.cmake
index 23f1b6c019..e3a3ca4cee 100644
--- a/dtool/Package.cmake
+++ b/dtool/Package.cmake
@@ -1,4 +1,9 @@
-set(THIRDPARTY_DIRECTORY "" CACHE PATH
+set(_thirdparty_dir_default "${PROJECT_SOURCE_DIR}/thirdparty")
+if(NOT (APPLE OR WIN32) OR NOT IS_DIRECTORY "${_thirdparty_dir_default}")
+  set(_thirdparty_dir_default "")
+endif()
+
+set(THIRDPARTY_DIRECTORY "${_thirdparty_dir_default}" CACHE PATH
   "Optional location of a makepanda-style thirdparty directory. All libraries
    located here will be prioritized over system libraries. Useful for
    cross-compiling.")