added <cmath> header in householder.h

git-svn-id: https://svn.dealii.org/trunk@11136 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/lac/include/lac/householder.h b/deal.II/lac/include/lac/householder.h
index ae30091ff38dc28d9e124cbcfa37777961091a16..3964c0951af81ffc3d7e6bc895f0bf79a2a5fed7 100644 (file)
--- a/deal.II/lac/include/lac/householder.h
+++ b/deal.II/lac/include/lac/householder.h
@@ -14,6 +14,7 @@
 #define __deal2__householder_h
 
 
+#include <cmath>
 #include <base/config.h>
 #include <lac/full_matrix.h>