This target cleans the build directory, recursively removing all things that the
Makefile builds. The cleaning rules have been made guarded so they shouldn't go
awry (via ``rm -f $(UNSET_VARIABLE)/*`` which will attempt to erase the entire
This target cleans the build directory, recursively removing all things that the
Makefile builds. The cleaning rules have been made guarded so they shouldn't go
awry (via ``rm -f $(UNSET_VARIABLE)/*`` which will attempt to erase the entire