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-rw-r--r--unsupported/Eigen/src/NonLinearOptimization/chkder.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/unsupported/Eigen/src/NonLinearOptimization/chkder.h b/unsupported/Eigen/src/NonLinearOptimization/chkder.h
index bc0cb1880..fd3e0bc4a 100644
--- a/unsupported/Eigen/src/NonLinearOptimization/chkder.h
+++ b/unsupported/Eigen/src/NonLinearOptimization/chkder.h
@@ -2,6 +2,8 @@
#define chkder_log10e 0.43429448190325182765
#define chkder_factor 100.
+namespace Eigen {
+
namespace internal {
template<typename Scalar>
@@ -58,3 +60,4 @@ void chkder(
} // end namespace internal
+} // end namespace Eigen