From a6ed584ae2f438874a379ee170148bc48a75729b Mon Sep 17 00:00:00 2001
From: David Landa Marban <dmar@norceresearch.no>
Date: Fri, 31 May 2024 09:00:57 +0200
Subject: [PATCH] [FIX]: Build issue if OpenMP is not present

---
 opm/simulators/linalg/ISTLSolverBda.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/opm/simulators/linalg/ISTLSolverBda.cpp b/opm/simulators/linalg/ISTLSolverBda.cpp
index 422905990..29a7e29df 100644
--- a/opm/simulators/linalg/ISTLSolverBda.cpp
+++ b/opm/simulators/linalg/ISTLSolverBda.cpp
@@ -124,7 +124,9 @@ apply(Vector& rhs,
 	      //NOTE: copyThread can safely write to jacMat because in solve_system both matrix and *blockJacobiForGPUILU0_ diagonal entries
 	      //are checked and potentially overwritten in replaceZeroDiagonal() by mainThread. However, no matter the thread writing sequence,
 	      //the final entry in jacMat is correct.
+#if HAVE_OPENMP
               copyThread = std::make_shared<std::thread>([&](){this->copyMatToBlockJac(matrix, *blockJacobiForGPUILU0_);});
+#endif // HAVE_OPENMP
 	    }
 	    else {
 	      this->copyMatToBlockJac(matrix, *blockJacobiForGPUILU0_);