Trees and forests problem found but on how to solve it.

[PATTON, BILLY \(SBCSI\)]

I have this :
define refresh_proj_bb_sub
$(1)+$(2)+$(3)+$(4) :
        cdir='$(CURDIR)' ; \
        $(CD) $(SRC_TREE)/$(2)/$(3)/$(4) ;\
        for X in $($(call merge,+,$(call uc,$(1)) $(2) $(3) $(4))) ; do
\
          if test -f $$$$X ; then \
                $(EXEC_LOG) -proj $(2) -bb $(3) $(PVCS_GET)
-v$(3)$(PVCS_VER) $$$$X ; \
          fi ; \
        done ; \
        $(CD) $$$$cdir
endef

When $($(call merge,+,$(call uc,$(1)) $(2) $(3) $(4))) produces the
names of 
a variable (a list) and this variable does not exist the result, from
warning, is:
CR inserted for readability
cdir='/home/users/bp1497' ; 
cd v0506/SOURCE_TREE/ldb/celltools/pub ; 
for X in  ; 
do 
  if test -f $X ; then 
    /home/users/bp1497/exec_log -log 
       /home/users/bp1497/v0506/log.2010115843 
          -proj ldb -bb celltools 
           /home/pvcs/vm/hpux/bin/get -vcelltools05.06.00.00 $X ; 
  fi ; 
done ; 
cd $cdir


Notice at the for X in  is empty.

This list does not exist.

So how can I set this up to see that the list exists?