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This is problematic if any two library/project contains the same class name.

So the question is, how can one remove multiple '../' from a path in Make. I've attempted the obvious and naive approaches with no results.

Update, the following will match exactly ../../ and replace it with the rest. This is perfect except that it is specific to ../../. Just need to make it match any number of ../../

 COBJS      :=  $(CFILES:../../%=%)
Update,
SOLVED, just three reputation shy of posting my own answer.
 COBJS      :=  $(subst ../,,$(CFILES))
As posted in my original question and I forgot to eventually answer.
The solution for this and likely many other Make string replacement is as follows:
COBJS      :=  $(subst ../,,$(CFILES))
'subst' takes 3 parameters.  $toMatch, $replaceWith, $string.
In this case $(CFILES) is the list of all .c files to compile.  I replace '../' with nothing.
A simple solution to your problem can be as follows. Consider a simple Makefile
path_to_remove := batch1/test2
path_to_add := earth/planet
my_paths := \
batch1/test2/p/a3.c \
batch1/test2/p/a2.c \
batch1/test2/p/a1.c  \
batch1/test2/q/b3.c \
batch1/test2/q/b2.c \
batch1/test2/q/b1.c
$(info [Original] [$(my_paths)])
my_paths := $(my_paths:$(path_to_remove)/%=$(path_to_add)/%)
$(info [New Changed] [$(my_paths)])
    @echo "Hi Universe"
When you run make command.
You will get ouput as:
[Original] [batch1/test2/p/a3.c batch1/test2/p/a2.c batch1/test2/p/a1.c batch1/test2/q/b3.c batch1/test2/q/b2.c batch1/test2/q/b1.c]
[New Changed] [earth/planet/p/a3.c earth/planet/p/a2.c earth/planet/p/a1.c earth/planet/q/b3.c earth/planet/q/b2.c earth/planet/q/b1.c]
        
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