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-rw-r--r--decoder/ff_source_syntax2_p.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/decoder/ff_source_syntax2_p.cc b/decoder/ff_source_syntax2_p.cc
index 130144fa..6a2ae742 100644
--- a/decoder/ff_source_syntax2_p.cc
+++ b/decoder/ff_source_syntax2_p.cc
@@ -3,7 +3,7 @@
#include <sstream>
#include <stack>
#include <string>
-#ifdef HAVE_CXX11
+#ifndef HAVE_OLD_CPP
# include <unordered_set>
#else
# include <tr1/unordered_set>