diff -upr gatling-0.15.orig/ssl.c gatling-0.15/ssl.c
--- gatling-0.15.orig/ssl.c	2016-10-25 20:38:51.818531071 +0200
+++ gatling-0.15/ssl.c	2016-10-25 20:39:10.235187184 +0200
@@ -9,6 +9,7 @@
 #include <openssl/ssl.h>
 #include <openssl/engine.h>
 #include <ctype.h>
+#include <alloca.h>
 
 static int library_inited;
 
