added a missing header file

diff --git a/bam_stat.c b/bam_stat.c
index b0cd3014f7f645fd608ceccb9993312c890274a4..81b7b6356ed2f32c255ddcf6129c38d84ca4ab15 100644 (file)
--- a/bam_stat.c
+++ b/bam_stat.c
@@ -1,3 +1,4 @@
+#include <unistd.h>
 #include "bam.h"
 
 typedef struct {