mingw/mingw-packages/mingw-w64-libpcap/0003-charconv-include-errno.patch

--- a/charconv.c
+++ b/charconv.c
@@ -33,6 +33,7 @@
  */
 
 #ifdef _WIN32
+#include <errno.h>
 #include <stdio.h>
 
 #include <pcap/pcap.h>	/* Needed for PCAP_ERRBUF_SIZE */