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-rw-r--r--src/datum_set.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/datum_set.cpp b/src/datum_set.cpp
index c9dfdb80..7fca783f 100644
--- a/src/datum_set.cpp
+++ b/src/datum_set.cpp
@@ -28,6 +28,7 @@
#include <errno.h>
#include <string.h>
+#include "proj.h"
#include "projects.h"
/* SEC_TO_RAD = Pi/180/3600 */