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-rw-r--r--src/PJ_nell.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/PJ_nell.c b/src/PJ_nell.c
index 51f9f99a..751c01c8 100644
--- a/src/PJ_nell.c
+++ b/src/PJ_nell.c
@@ -1,4 +1,7 @@
#define PJ_LIB__
+
+#include <math.h>
+
#include "projects.h"
PROJ_HEAD(nell, "Nell") "\n\tPCyl., Sph.";
@@ -46,4 +49,3 @@ PJ *PROJECTION(nell) {
return P;
}
-