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-rw-r--r--runtime/tools/blink.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/runtime/tools/blink.c b/runtime/tools/blink.c
index 5b5b281723..a782061fdd 100644
--- a/runtime/tools/blink.c
+++ b/runtime/tools/blink.c
@@ -6,9 +6,10 @@
*/
#include <stdio.h>
+#include <unistd.h>
int
-main()
+main(void)
{
while (1)
{