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911da26f96
Unfortunately, CC ?= afl-gcc doesn't work. This is because CC has a default value (of "cc"), and the ?= operator only assigns a value if the variable previously had none. "make" currently compiles with cc. In this patch, I implemented the more elaborate way to achieve what was probably intended: "make" will use afl-gcc now, and "make CC=foo" will compile with "foo".