--- spot/misc/tmpfile.cc.orig	2018-10-04 12:40:02 UTC
+++ spot/misc/tmpfile.cc
@@ -23,6 +23,7 @@
 #include <cstdlib>
 #include <unistd.h>
 #include <string.h>
+#include <stdlib.h>
 
 namespace spot
 {