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-rw-r--r--internal/ceres/schur_eliminator_impl.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/internal/ceres/schur_eliminator_impl.h b/internal/ceres/schur_eliminator_impl.h
index c09b7fb..305d94e 100644
--- a/internal/ceres/schur_eliminator_impl.h
+++ b/internal/ceres/schur_eliminator_impl.h
@@ -45,6 +45,9 @@
#define EIGEN_CACHEFRIENDLY_PRODUCT_THRESHOLD 10
+// This include must come before any #ifndef check on Ceres compile options.
+#include "ceres/internal/port.h"
+
#ifdef CERES_USE_OPENMP
#include <omp.h>
#endif