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-rw-r--r--src/mlfn.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mlfn.cpp b/src/mlfn.cpp
index e032e642..e6bbd152 100644
--- a/src/mlfn.cpp
+++ b/src/mlfn.cpp
@@ -1,5 +1,6 @@
#include <math.h>
+#include "proj.h"
#include "projects.h"
/* meridional distance for ellipsoid and inverse