I’m trying to create a makefile to build with different flavors.
i.e.

platformA:  CC := gcc
platformB:  CC := some-3rd-party-gcc

DIRS        := $(shell find ad/src -type d) 
             $(shell find ad/api -type d)
BUILD_DIR       := ad/obj

INCLUDES    = $(addprefix -I,$(DIRS) $(EXTRA))
SOURCES     = $(shell find $(DIRS) -maxdepth 1 -name '*.c') 
                     $(shell find $(EXTRA) -maxdepth 1 -name '*.c')
OBJECTS = $(patsubst %,$(BUILD_DIR)/%,$(SOURCES:.c=.o))


platformA:  EXTRA = $(shell find /ad/platA -type d)
platformB:  EXTRA = $(shell find /ad/platB -type d)

platformA platformB: TARGET=output

$(TARGET): $(OBJECTS)
    @echo Prequisitoins: $(OBJECTS) | sed -e "s/ /n/g"
    @echo "-------------------"
    @echo Prequisitoins: $? | sed -e "s/ /n/g"
    @echo "-------------------"

(I have shortened the parts I copied here, just to show the issue)

When I run the makefile, I get different output, from the $(OBJECTS) echo line and from the ($?) echo line.

What am I missing here?