Try to fix compile failure on Arch.

diff --git a/test/read_smpte_subtitle_test.cc b/test/read_smpte_subtitle_test.cc
index 0ce3eea93313454cd4ae74807729dccf374efa54..f4d2810637d86717825f9251ec22d9daa12fe987 100644 (file)
--- a/test/read_smpte_subtitle_test.cc
+++ b/test/read_smpte_subtitle_test.cc
@@ -23,6 +23,7 @@
 #include "smpte_load_font_node.h"
 #include <boost/test/unit_test.hpp>
 #include <boost/optional.hpp>
+#include <boost/optional/optional_io.hpp>
 
 using std::list;
 using boost::shared_ptr;