ifeq and ifneq and/or help

[PATTON, BILLY \(SBCSI\)]

I need to make some decision on how to load some files.
I have 6 flows: build, refresh, linktree, clean, depend and product
I have 6 files: make.<flow> that contain foreach loop that use evals to
create targets on the fly.

Loading the 6 files takes just a little more than 10 minutes.  They
create 72k + targets.  Not all these targets are necessary.
Examples of make and what they need

make           < needs build linktree and product
make build     < needs build
make refresh   < needs build and refresh
make clean     < needs clean
make depend    < needs build linktree depend
make linktree  < needs build linktree
make anything that doesn't begin with the named 6 needs build refresh
and product
it is possible to do a 
make build+ldb+bb+topic  < needs build
make ldb < needs build refresh and product

Since I have been unable to get the gmsl or to function as the examples
are I need to do the and/or in another method.  This is where I need
help.  I don't want to load the file multiple times.

So what I need is
ifneq (,$(findstring build,$(MAKECMDGOALS)))
include make.build
endif

ifneq (,$(MAKECMDGOALS) is empty)
include make.build
include make.refresh
include make.prod
endif

Or could I:
ifneq (,$(findstring build,$(MAKECMDGOALS)))
  include make.build
else
  ifneq (,$(findstring refresh,$(MAKECMDGOALS)))
    include make.build
    include make.refresh
  else
    ifneq (,$(findstring clean,$(MAKECMDGOALS)))
      include make.clean
    else
      ifneq (,$(findstring depend,$(MAKECMDGOALS)))
        include make.build
        include make.linktree
        include make.depend
      else
        ifneq (,$(findstring linktree,$(MAKECMDGOALS)))
          include make.build
          include make.linktree
        else
          include make.build
          include make.linktree
          include make.product
        endif
      endif
    endif
  endif
endif

As long as just one at a time is done I think this would work.
But if I told it to do a clean and refresh this would not work.
Just tried this before I emailed this.  It does work, but would prefer
to bee able to have and/or type constructs to include files for
combinations on the make command line.