io.c: Add include for `<time.h>`.

This is used by the delay code in `get_key()`.

1 files changed, 3 insertions, 0 deletions

diff --git a/io.c b/io.c
index a3eb061..13b7819 100644
--- a/io.c
+++ b/io.c
@@ -1,4 +1,7 @@
 #include "sux.h"
+#if delay_clk && getclk && !bench
+#include <time.h>
+#endif
 
 #define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
 #define DEFAULT(a, b) (a) = (a) ? (a) : (b)