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diff --git a/postgresql-8.4.13/src/backend/utils/misc/guc.c b/postgresql-8.4.13/src/backend/utils/misc/guc.c
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index 0ceb89f..03f4f79 100644
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--- a/postgresql-8.4.13/src/backend/utils/misc/guc.c
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+++ b/postgresql-8.4.13/src/backend/utils/misc/guc.c
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@@ -2421,7 +2421,7 @@ static struct config_string ConfigureNamesString[] =
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 			GUC_SUPERUSER_ONLY
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 		},
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 		&UnixSocketDir,
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-		"", assign_canonical_path, NULL
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+		"/var/run/postgresql/", assign_canonical_path, NULL
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 	},
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 	{