I can't find build_extension.xml
I am using RapidMiner5.3.0, and I want to extend it.
I download zip file from github https://github.com/rapidminer/rapidminer-extension-template/releases/tag/ANT
But when I execute ant task, it shows that build_extension.xml imported form build.xml can't be found.
This is the project I download, I do not find build_extension.xml. Where is it?
ps: I have to use RapidMiner5, so don't just tell me don't use it and go to RapidMiner8, thanks a lot!