src/sn-markov.c: Add missing include.

diff --git a/src/sn-markov.c b/src/sn-markov.c
index 3537023..1fcc41d 100644 (file)
--- a/src/sn-markov.c
+++ b/src/sn-markov.c
@@ -39,6 +39,7 @@
 #include <signal.h>
 #include <assert.h>
 #include <limits.h>
+#include <errno.h>
 
 #include "sn_network.h"
 #include "sn_random.h"