From c0b5917c077ef4b3ccc467cbe7a7bbf969af56f4 Mon Sep 17 00:00:00 2001
From: Corentin Le Molgat <corentinl@google.com>
Date: Mon, 15 Dec 2025 12:52:28 +0100
Subject: [PATCH] math_opt: fix xpress_solver build on windows

---
 ortools/math_opt/solvers/xpress_solver.cc | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/ortools/math_opt/solvers/xpress_solver.cc b/ortools/math_opt/solvers/xpress_solver.cc
index b5fad9a287..a5d1d41fa6 100644
--- a/ortools/math_opt/solvers/xpress_solver.cc
+++ b/ortools/math_opt/solvers/xpress_solver.cc
@@ -102,8 +102,7 @@ class ScopedCallback {
       if constexpr (std::is_convertible_v<R, int>) return static_cast<int>(1);
     }
   };
-  static constexpr proto_type low_level_cb =
-      ExWrapper<proto_type>::low_level_cb;
+  const proto_type low_level_cb = ExWrapper<proto_type>::low_level_cb;
 
  public:
   CbT or_tools_cb;