IModel does not contain a CreateBasicProperties method

[boskjoett]

I am trying to use the RabbitMQ.Client library source code directly (not via NuGet package) in my project.
When I compile the project I get this error:
'IModel' does not contain a definition for 'CreateBasicProperties' and no accessible extension method 'CreateBasicProperties' accepting a first argument of type 'IModel' could be found (are you missing a using directive or an assembly reference?)

Why does this IModel implementation
https://github.com/rabbitmq/rabbitmq-dotnet-client/blob/main/projects/RabbitMQ.Client/client/api/IModel.cs
not contain a CreateBasicProperties method?

According to this documentation page it should
https://rabbitmq.github.io/rabbitmq-dotnet-client/api/RabbitMQ.Client.IModel.html#RabbitMQ_Client_IModel_CreateBasicProperties

[boskjoett]

I can see that it is only missing on main branch.
It is defined in version 6.4.0
https://github.com/rabbitmq/rabbitmq-dotnet-client/blob/v6.4.0/projects/RabbitMQ.Client/client/api/IModel.cs
so I guess it has been obsoleted.

[boskjoett]

I tried to compile the library source code tagged 6.4.0, but it failed because this project file
https://github.com/rabbitmq/rabbitmq-dotnet-client/blob/v6.4.0/projects/RabbitMQ.Client/RabbitMQ.Client.csproj
references this source code file that cannot be found
<Compile Include="..\..\gensrc\autogenerated-api-0-9-1.cs" />

How can I get the autogenerated-api-0-9-1.cs file?

[lukebakken]

Run .\build.bat first.