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-rw-r--r--src/proj_4D_api.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/proj_4D_api.c b/src/proj_4D_api.c
index aed4685b..70110746 100644
--- a/src/proj_4D_api.c
+++ b/src/proj_4D_api.c
@@ -30,6 +30,7 @@
#include <errno.h>
#include "proj.h"
#include "proj_internal.h"
+#include "proj_math.h"
#include "projects.h"
#include "geodesic.h"