From eff80a8f14917b83cb5d66c4347e1d3475741184 Mon Sep 17 00:00:00 2001
From: Timo Heister <timo.heister@gmail.com>
Date: Fri, 2 Sep 2022 10:13:18 -0400
Subject: [PATCH] fix: step-50 PETSc

add a missing include
---
 examples/step-50/step-50.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/examples/step-50/step-50.cc b/examples/step-50/step-50.cc
index c315c2dad5..f07a70f08d 100644
--- a/examples/step-50/step-50.cc
+++ b/examples/step-50/step-50.cc
@@ -43,6 +43,7 @@
 #include <deal.II/grid/tria.h>
 #include <deal.II/lac/affine_constraints.h>
 #include <deal.II/lac/dynamic_sparsity_pattern.h>
+#include <deal.II/lac/sparsity_tools.h>
 #include <deal.II/lac/solver_cg.h>
 
 // We use the same strategy as in step-40 to switch between PETSc and
-- 
2.39.5