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-rw-r--r--src/libexpr/symbol-table.hh9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/libexpr/symbol-table.hh b/src/libexpr/symbol-table.hh
index 424c23538..20ebe5fed 100644
--- a/src/libexpr/symbol-table.hh
+++ b/src/libexpr/symbol-table.hh
@@ -1,8 +1,13 @@
#ifndef __SYMBOL_TABLE_H
#define __SYMBOL_TABLE_H
+#include "config.h"
+
#include <map>
+
+#if HAVE_TR1_UNORDERED_SET
#include <tr1/unordered_set>
+#endif
#include "types.hh"
@@ -60,7 +65,11 @@ inline std::ostream & operator << (std::ostream & str, const Symbol & sym)
class SymbolTable
{
private:
+#if HAVE_TR1_UNORDERED_SET
typedef std::tr1::unordered_set<string> Symbols;
+#else
+ typedef std::set<string> Symbols;
+#endif
Symbols symbols;
public: