Hi, We are trying to construct basic environment for porting starlingX on Debian. While when I dealing with the build order of user space packages, the loop dependent problem blocked me. The easiest example: source package A build depend on B while B is also build depend on A. We can just build A, B, A, B and only use the later result. A fairly complex example: A depends on B and C, B depends on D, C depends on F, D depends on A and F. In this case there will be three cycles as below: A->B->D->A, A->B->D->F->A, A->C->F->A . Even more, if in some cases we needn't B or D, then we have only one cycle: ACFA I tried to find a method to deal with it but failed. So I wonder how did we deal with such loop dependent before, on CentOS. Any advises about it? Thanks a lot Xiao