Potential instructions for trying this on Mac (I was unable to make it work, perhaps we can build upon this):

curl -LO http://lcamtuf.coredump.cx/afl.tgz

tar zxvf afl.tgz

rm afl.tgz

cd afl*

make afl-gcc

make afl-fuzz

mkdir in_dir

echo 'hello' >in_dir/hello

# there is a glitch with the libjpeg-turbo-1.3.1 configure file that makes it difficult to compile on Mac, so I tried regular libjpeg:

curl -LO http://www.ijg.org/files/jpegsrc.v8c.tar.gz

tar zxvf jpegsrc.v8c.tar.gz

cd jpeg-8c/

CC=../afl-gcc ./configure

make

# error: C compiler cannot create executables

# if the above command worked to build an instrumented djpeg, then this should work

cd ..

./afl-fuzz -i in_dir -o out_dir ./jpeg-8c/djpeg