FYI, here's one way to handle it (obviously requires GNU make):

  ifeq (,$(filter second-expansion,$(.FEATURES)))
    # GNU make <3.81
    PRE_D := $$
  else
    # GNU make >=3.81
    PRE_D := $$$$
  endif

  # Now use PRE_D in prerequisites

  all: foo$(PRE_D)bar ; @echo '$@: $<'

  foo$$bar: ; @echo 'building $@'


-- 
-------------------------------------------------------------------------------
 Paul D. Smith <[EMAIL PROTECTED]>          Find some GNU make tips at:
 http://www.gnu.org                      http://make.paulandlesley.org
 "Please remain calm...I may be mad, but I am a professional." --Mad Scientist


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