[BUGFIX] parser.hpp: fix include guard so the header is actually usable.

diff --git a/ginac/parser/parser.hpp b/ginac/parser/parser.hpp
index 3e10b8fc016bacc9a685918c969a89d36c451841..a87bcae0457c217d1677e1246c33af2fbccc9c9c 100644 (file)
--- a/ginac/parser/parser.hpp
+++ b/ginac/parser/parser.hpp
@@ -1,4 +1,5 @@
 #ifndef GINAC_PARSER_HPP_
+#define GINAC_PARSER_HPP_
 
 #include "parse_context.hpp"
 #include <stdexcept>