-DROP_SECTIONS := .reginfo .mdebug .comment .note .pdr .options .MIPS.options
-OBJCOPY_SREC := $(TARGET_CROSS)objcopy -S -O srec $(addprefix --remove-section=,$(DROP_SECTIONS))
+DROP_SECTIONS:=.reginfo .mdebug .comment .note .pdr .options .MIPS.options
+OBJCOPY_SREC:=$(TARGET_CROSS)objcopy -S -O srec $(addprefix --remove-section=,$(DROP_SECTIONS))