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-rw-r--r--src/survive_data.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/survive_data.c b/src/survive_data.c
index 0273532..7b9d051 100644
--- a/src/survive_data.c
+++ b/src/survive_data.c
@@ -4,6 +4,7 @@
#include "survive_internal.h"
#include <stdint.h>
#include <string.h>
+#include <math.h> /* for sqrt */
#define USE_TURVEYBIGUATOR