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-rw-r--r--internal/ceres/visibility_based_preconditioner_test.cc3
1 files changed, 3 insertions, 0 deletions
diff --git a/internal/ceres/visibility_based_preconditioner_test.cc b/internal/ceres/visibility_based_preconditioner_test.cc
index 2edbb18..c718b5e 100644
--- a/internal/ceres/visibility_based_preconditioner_test.cc
+++ b/internal/ceres/visibility_based_preconditioner_test.cc
@@ -28,6 +28,9 @@
//
// Author: sameeragarwal@google.com (Sameer Agarwal)
+// This include must come before any #ifndef check on Ceres compile options.
+#include "ceres/internal/port.h"
+
#ifndef CERES_NO_SUITESPARSE
#include "ceres/visibility_based_preconditioner.h"