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-rw-r--r--src/gravity.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/gravity.c b/src/gravity.c
index 4f8fdc1..3af3e7a 100644
--- a/src/gravity.c
+++ b/src/gravity.c
@@ -1,4 +1,5 @@
#include <math.h>
+#include <sys/types.h>
#include <pthread.h>
#include "defines.h"
#include "gravity.h"