Freebsd buildworld process

In /usr/src/Makefile.inc1, the target 'buildworld' is composed of several WMAKE_TGTS components: _worldtmp _legacy _bootstrap-tools _cleanobj _obj _build-tools _cross-tools _includes _libraries _depend everything

_worldtmp: mkdir to make directory tree of object files
_legacy: build & install /usr/src/tools/build
_bootstrap-tools: build & install strfile, gperf, groff, etc. tools.
_cleanobj: for SUBDIRs do cleandir
_obj: rebuilding object tree(?)
_build-tools
_cross-tools
_includes
_libraries
_depend
everything