>>> setools 4.1.1 Extracting
gzip -d -c /home/buildroot/build/instance-0/dl/setools-4.1.1.tar.gz | tar --strip-components=1 -C /home/buildroot/build/instance-0/output/build/setools-4.1.1   -xf -
>>> setools 4.1.1 Patching

Applying 0001-remove-werror-flag-from-setup.patch using patch: 
patching file setup.py

Applying 0002-Do-not-export-use-setools.InfoFlowAnalysis-and-setoo.patch using patch: 
patching file sedta
patching file seinfoflow
patching file setools/__init__.py
patching file setoolsgui/apol/dta.py
patching file setoolsgui/apol/infoflow.py
patching file tests/dta.py
patching file tests/infoflow.py
# By default, setup.py will look for libsepol.a in the host machines
# /usr/lib directory. This needs to be changed to the staging directory.
/bin/sed -i -e "s@base_lib_dirs =.*@base_lib_dirs = ['/home/buildroot/build/instance-0/output/host/arm-buildroot-linux-gnueabihf/sysroot/lib']@g" /home/buildroot/build/instance-0/output/build/setools-4.1.1/setup.py
>>> setools 4.1.1 Configuring
>>> setools 4.1.1 Building
(cd /home/buildroot/build/instance-0/output/build/setools-4.1.1//; _PYTHON_SYSCONFIGDATA_NAME="_sysconfigdata_m_linux_arm-linux-gnueabihf" PATH="/home/buildroot/build/instance-0/output/host/bin:/home/buildroot/build/instance-0/output/host/sbin:/sbin:/usr/sbin:/bin:/usr/bin" PYTHONPATH="/home/buildroot/build/instance-0/output/target/usr/lib/python3.6/" PYTHONNOUSERSITE=1 _python_sysroot=/home/buildroot/build/instance-0/output/host/arm-buildroot-linux-gnueabihf/sysroot _python_prefix=/usr _python_exec_prefix=/usr  /home/buildroot/build/instance-0/output/host/bin/python setup.py build  )
Unable to find a libsepol.so on your system!
Looked in the following directories:
/home/buildroot/build/instance-0/output/host/arm-buildroot-linux-gnueabihf/sysroot/lib
Please set the SEPOL or SEPOL_SRC environment variables. Exiting.
package/pkg-generic.mk:234: recipe for target '/home/buildroot/build/instance-0/output/build/setools-4.1.1/.stamp_built' failed
make: *** [/home/buildroot/build/instance-0/output/build/setools-4.1.1/.stamp_built] Error 1
make: Leaving directory '/home/buildroot/build/instance-0/buildroot'