not on qemu 3 anymore
MODIFY
qemu_mode/build_qemu_support.sh
qemu_mode/build_qemu_support.sh
# TCG instrumentation and block chaining support by Andrea Biondo
# <andrea.biondo965@gmail.com>
#
-# QEMU 3.1.1 port, TCG thread-safety, CompareCoverage and NeverZero
+# QEMU 5+ port, TCG thread-safety, CompareCoverage and NeverZero
# counters by Andrea Fioraldi <andreafioraldi@gmail.com>
#
# Copyright 2015, 2016, 2017 Google Inc. All rights reserved.

not on qemu 3 anymore