perl: install private Error.pm if the site version is older than our own

diff --git a/builtin-rev-list.c b/builtin-rev-list.c
index 51858e3233a74a2a5cc7e96e7dc5d9786fecc326..b86e7ca8b18c7d11886dd3a1b4ca0eba95af264a 100644 (file)
--- a/builtin-rev-list.c
+++ b/builtin-rev-list.c
@@ -35,6 +35,7 @@ static const char rev_list_usage[] =
 "    --header | --pretty\n"
 "    --abbrev=nr | --no-abbrev\n"
 "    --abbrev-commit\n"
+"    --left-right\n"
 "  special purpose:\n"
 "    --bisect"
 ;