fix compile error on centos7

I have no idea why this worked without the include? fixes #478

1 files changed, 1 insertions, 0 deletions

diff --git a/logger.c b/logger.c
index a8a6c23..b8cf963 100644
--- a/logger.c
+++ b/logger.c
@@ -6,6 +6,7 @@
 #include <errno.h>
 #include <poll.h>
 #include <ctype.h>
+#include <stdarg.h>
 
 #if defined(__sun)
 #include <atomic.h>