 The former is a perl-based build system and the latter is built using Python and supports the next generation Symbian OS operating systems.The main advantage of supporting SBSv1 and v2 in Carbide is users can create command-line builds in parallel with IDE builds and not have to manage two different workspaces.The disadvantage of SBSv1 is dependency checking is automatic on every build and re-building large projects to take a while.