From aa6691e23c1145f5e2b3c8d59911d175b114d2df Mon Sep 17 00:00:00 2001
From: Ghislain Vaillant <ghisvail@users.noreply.github.com>
Date: Mon, 24 Nov 2025 14:22:17 +0100
Subject: [PATCH] Allow use of system pybind11

In case pybind11 is not available through find_package, fall back to the previous behavior.
---
 CMakeLists.txt | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3c81d62..4ef1fee 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -38,7 +38,10 @@ set(CMAKE_CXX_STANDARD 11)
 # --------------------------------------------------
 
 # initialize pybind for python wrapping
-add_subdirectory(${pybind11_DIR} pybind11)
+find_package(pybind11 CONFIG)
+if(NOT pybind11_FOUND)
+  add_subdirectory(${pybind11_DIR} pybind11)
+endif()
 message(STATUS "ITK_DIR=${ITK_DIR} pybind11_DIR=${pybind11_DIR}")