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-rw-r--r--src/tsfn.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/tsfn.cpp b/src/tsfn.cpp
index ea3b896d..fb299dc9 100644
--- a/src/tsfn.cpp
+++ b/src/tsfn.cpp
@@ -1,5 +1,6 @@
/* determine small t */
#include <math.h>
+#include "proj.h"
#include "projects.h"
double pj_tsfn(double phi, double sinphi, double e) {