File stdlib2-config.patch of Package stdlib2
diff -Ndurp stdlib2/rebar.config stdlib2-config/rebar.config
--- stdlib2/rebar.config 2016-09-12 11:35:54.000000000 +0300
+++ stdlib2-config/rebar.config 2022-06-10 16:41:57.953494635 +0300
@@ -1,6 +1,7 @@
{lib_dirs, ["deps"]}.
{deps_dir, ["deps"]}.
-{require_otp_vsn, "(R1[456])|1[78]"}.
+{require_otp_vsn, "(R1[456])|1[789]|2[0-6]"}.
+{edoc_opts, [{preprocess, true}]}.
{erl_opts, [ debug_info
, nowarn_shadow_vars
, warnings_as_errors