Last updated: 13/02/2018
Depending on buildcraft
When BuildCraft 8 reaches beta the API will be stable until release, and we won't break things between alpha releases. However the maven is available now, at https://mod-buildcraft.com/maven.
3 different modules are available, "com.mod-buildcraft:buildcraft-api", "com.mod-buildcraft:buildcraft-lib", or "com.mod-buildcraft:buildcraft". For the correct version refer to the download page. Note that testing versions are not available this way.
(Full instructions for depending on buildcraft will be added when we reach beta.)