How to use relative path when using UBT to build Unreal visual studio solution

I am using UnrealBuildTool (UBT) to build the Unreal Engine 4 source code.

This is the code:

UnrealBuildTool.exe -projectfiles -project=“C:/projectname/projectname.uproject” -game -rocket -progress

Right now only full project path works for the -project parameter, is there a way to use relative path, like:

UnrealBuildTool.exe -projectfiles -project=“projectname/projectname.uproject” -game -rocket -progress

Because I am using jenkins to do the automation for Unreal project and I don’t want to use full path for when I build the solution file.