# Developer Guides

# Adding extra repositories for sfdk development

When doing manual builds or wanting to supply the SDK with external libraries. Proceed as follows:  
1\. setup: sfdk config target="SailfishOS-5.0.0.62-aarch64"  
2\. sfdk build-init  
3\. sfdk build-shell --maintain  
4\. su ar sailfishos-chum https://repo.sailfishos.org/obs/sailfishos:/chum/5.0\_aarch64/  
5\. zypper install libupnp-devel libupnpp (for instance)  
6\. exit and go

Given the 'target' you will have used a root shell to add the chum repos and can now use libraries from chum for the local build in either the SDK or using sfdk make and co.