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-rw-r--r--src/projections/ortho.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/projections/ortho.cpp b/src/projections/ortho.cpp
index 94764756..34b6b689 100644
--- a/src/projections/ortho.cpp
+++ b/src/projections/ortho.cpp
@@ -2,7 +2,7 @@
#include <errno.h>
#include "proj.h"
#include "proj_internal.h"
-#include "proj_math.h"
+#include <math.h>
PROJ_HEAD(ortho, "Orthographic") "\n\tAzi, Sph";