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rebar.config.script

case os:getenv("TARGET_ERLANG_VERSION") of
false -> CONFIG;
[] -> CONFIG;
TargetErlangVersionString ->
GpbOpts = proplists:get_value(gpb_opts, CONFIG),
TargetErlangVersion = {target_erlang_version, list_to_integer(TargetErlangVersionString)},
NewGpbOpts = lists:keystore(target_erlang_version, 1, GpbOpts, TargetErlangVersion),
lists:keystore(gpb_opts, 1, CONFIG, {gpb_opts, NewGpbOpts})
end.