From 8247d1a7e00dd7ec747f65887453f7abcdaf5f41 Mon Sep 17 00:00:00 2001
From: pratikdeoke <deokepratik3@gmail.com>
Date: Sun, 18 Oct 2026 21:53:56 +0530
Subject: [PATCH] GH-53995: [C++] Fix FetchContent build failure on CMake <
 3.30

---
 cpp/cmake_modules/ThirdpartyToolchain.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cpp/cmake_modules/ThirdpartyToolchain.cmake b/cpp/cmake_modules/ThirdpartyToolchain.cmake
index 01e1ab147af..e318be61eb6 100644
--- a/cpp/cmake_modules/ThirdpartyToolchain.cmake
+++ b/cpp/cmake_modules/ThirdpartyToolchain.cmake
@@ -371,7 +371,7 @@ endmacro()
 # ----------------------------------------------------------------------
 # Thirdparty versions, environment variables, source URLs
 
-set(THIRDPARTY_DIR "${arrow_SOURCE_DIR}/thirdparty")
+set(THIRDPARTY_DIR "${ARROW_SOURCE_DIR}/thirdparty")
 
 add_library(arrow::flatbuffers INTERFACE IMPORTED)
 target_include_directories(arrow::flatbuffers