Avoid error with undefined fabs with gcc2.97

git-svn-id: https://svn.dealii.org/trunk@3379 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/deal.II/source/grid/grid_refinement.cc b/deal.II/deal.II/source/grid/grid_refinement.cc
index 85f8f9acd71c8eeaafaca4580e7871637ea820c5..df1e59b8b4f2e141f42e59cbed9df6d791d4e5cc 100644 (file)
--- a/deal.II/deal.II/source/grid/grid_refinement.cc
+++ b/deal.II/deal.II/source/grid/grid_refinement.cc
@@ -20,6 +20,7 @@
 
 #include <numeric>
 #include <algorithm>
+#include <cmath>