It turns out there were a lot of these.
This changes the buildlink3.mk files to use an include guard for the recursive include. The use of BUILDLINK_DEPTH, BUILDLINK_DEPENDS, BUILDLINK_PACKAGES and BUILDLINK_ORDER is handled by a single new variable BUILDLINK_TREE. Each buildlink3.mk file adds a pair of enter/exit marker, which can be used to reconstruct the tree and to determine first level includes. Avoiding := for large variables (BUILDLINK_ORDER) speeds up parse time as += has linear complexity. The include guard reduces system time by avoiding reading files over and over again. For complex packages this reduces both %user and %sys time to half of the former time.
Michael Rohrer in wip. GGZ Gaming Zone GGZ is a project to create a free gaming platform. The project includes a server, games for the server, clients, and games for the clients. Other projects may include ggz networking into their games. GNOME games project and Freeciv 2.1 releases use ggz. This package contains the base libraries the server and clients depend on.