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[PATTON, BILLY \(SBCSI\)]

To all John Graham-Cumming and Paul D. Smith  I now have the basics
working.

Please accept my most humble thanks for your effort in assisting me.
Just a FYI, Here's what I finished with:
FLOWS    := build mkdir clean real_clean refresh real_refresh linktree
depend
PROJECTS := lde ldg ldm ldf ldw lbf ldb
BB_lde := a
BB_ldg := b c
BB_ldm := d e f
BB_ldf := g h i j
BB_ldw := k l n m o
BB_lbf := p q r s t u
BB_ldb := v w x y z aa ab
.PHONY : all  $(addprefix mkdir_,${PROJECTS})

define mkdir_proj_template
$(1): ; @echo " mkdir_proj_template $(1)"
endef

all : $(addprefix mkdir_,${PROJECTS})

$(foreach proj,$(PROJECTS),$(foreach bb,$(addprefix
mkdir_,$(proj)),$(eval $(call mkdir_proj_template,${bb}))))