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-rw-r--r--src/projections/nsper.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/projections/nsper.cpp b/src/projections/nsper.cpp
index d641e1b6..059b9f71 100644
--- a/src/projections/nsper.cpp
+++ b/src/projections/nsper.cpp
@@ -2,7 +2,7 @@
#include <errno.h>
#include "proj.h"
#include "proj_internal.h"
-#include "proj_math.h"
+#include <math.h>
namespace { // anonymous namespace
enum Mode {