1 files changed, 6 insertions, 0 deletions
diff --git a/fmtutils.h b/fmtutils.h
index ba0f66ca..4fa34486 100644
--- a/fmtutils.h
+++ b/fmtutils.h
@@ -34,6 +34,8 @@
 #ifndef fmtutils_h
 #define	fmtutils_h
 
+#include <stdarg.h>	/* we declare varargs functions */
+
 #include "pcap/funcattrs.h"
 
 #ifdef __cplusplus
@@ -44,10 +46,14 @@ void	pcap_fmt_set_encoding(unsigned int);
 
 void	pcap_fmt_errmsg_for_errno(char *, size_t, int,
     PCAP_FORMAT_STRING(const char *), ...) PCAP_PRINTFLIKE(4, 5);
+void	pcap_vfmt_errmsg_for_errno(char *, size_t, int,
+    PCAP_FORMAT_STRING(const char *), va_list) PCAP_PRINTFLIKE(4, 0);
 
 #ifdef _WIN32
 void	pcap_fmt_errmsg_for_win32_err(char *, size_t, DWORD,
     PCAP_FORMAT_STRING(const char *), ...) PCAP_PRINTFLIKE(4, 5);
+void	pcap_vfmt_errmsg_for_win32_err(char *, size_t, DWORD,
+    PCAP_FORMAT_STRING(const char *), va_list) PCAP_PRINTFLIKE(4, 0);
 #endif
 
 #ifdef __cplusplus