Unable to figure out what is causing this error while trying to update to 0.92.0
ERROR: Complete output from command /srv/homeassistant/bin/python3 /srv/homeassistant/lib/python3.5/site-packages/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-bsn1p3mh/overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple --extra-index-url https://www.piwheels.org/simple -- 'setuptools>=18.5' wheel 'cffi>=1.8,!=1.11.3; python_implementation != '"'"'PyPy'"'"'':
ERROR: Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple, https://www.piwheels.org/simple
Collecting setuptools>=18.5
Using cached https://files.pythonhosted.org/packages/ec/51/f45cea425fd5cb0b0380f5b0f048ebc1da5b417e48d304838c02d6288a1e/setuptools-41.0.1-py2.py3-none-any.whl
Collecting wheel
Using cached https://files.pythonhosted.org/packages/96/ba/a4702cbb6a3a485239fbe9525443446203f00771af9ac000fa3ef2788201/wheel-0.33.1-py2.py3-none-any.whl
Collecting cffi!=1.11.3,>=1.8
Using cached https://files.pythonhosted.org/packages/93/1a/ab8c62b5838722f29f3daffcc8d4bd61844aa9b5f437341cc890ceee483b/cffi-1.12.3.tar.gz
Collecting pycparser (from cffi!=1.11.3,>=1.8)
Using cached https://www.piwheels.org/simple/pycparser/pycparser-2.19-py2.py3-none-any.whl
ERROR: homeassistant 0.91.4 has requirement PyJWT==1.6.4, but you'll have pyjwt 1.7.1 which is incompatible.
ERROR: homeassistant 0.91.4 has requirement python-slugify==1.2.6, but you'll have python-slugify 3.0.2 which is incompatible.
ERROR: homeassistant 0.91.4 has requirement ruamel.yaml==0.15.89, but you'll have ruamel-yaml 0.15.91 which is incompatible.
Installing collected packages: setuptools, wheel, pycparser, cffi
Running setup.py install for cffi: started
Running setup.py install for cffi: finished with status 'error'
ERROR: Complete output from command /srv/homeassistant/bin/python3 -u -c 'import setuptools, tokenize;__file__='"'"'/tmp/pip-install-wlsvbm01/cffi/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-0__y3gp_/install-record.txt --single-version-externally-managed --prefix /tmp/pip-build-env-bsn1p3mh/overlay --compile --install-headers /srv/homeassistant/include/site/python3.5/cffi:
ERROR: Package libffi was not found in the pkg-config search path.
Perhaps you should add the directory containing `libffi.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libffi' found
Package libffi was not found in the pkg-config search path.
Perhaps you should add the directory containing `libffi.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libffi' found
Package libffi was not found in the pkg-config search path.
Perhaps you should add the directory containing `libffi.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libffi' found
Package libffi was not found in the pkg-config search path.
Perhaps you should add the directory containing `libffi.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libffi' found
Package libffi was not found in the pkg-config search path.
Perhaps you should add the directory containing `libffi.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libffi' found
running install
running build
running build_py
creating build
creating build/lib.linux-armv7l-3.5
creating build/lib.linux-armv7l-3.5/cffi
copying cffi/setuptools_ext.py -> build/lib.linux-armv7l-3.5/cffi
copying cffi/vengine_cpy.py -> build/lib.linux-armv7l-3.5/cffi
copying cffi/api.py -> build/lib.linux-armv7l-3.5/cffi
copying cffi/cffi_opcode.py -> build/lib.linux-armv7l-3.5/cffi
copying cffi/model.py -> build/lib.linux-armv7l-3.5/cffi
copying cffi/verifier.py -> build/lib.linux-armv7l-3.5/cffi
copying cffi/backend_ctypes.py -> build/lib.linux-armv7l-3.5/cffi
copying cffi/recompiler.py -> build/lib.linux-armv7l-3.5/cffi
copying cffi/cparser.py -> build/lib.linux-armv7l-3.5/cffi
copying cffi/lock.py -> build/lib.linux-armv7l-3.5/cffi
copying cffi/error.py -> build/lib.linux-armv7l-3.5/cffi
copying cffi/pkgconfig.py -> build/lib.linux-armv7l-3.5/cffi
copying cffi/ffiplatform.py -> build/lib.linux-armv7l-3.5/cffi
copying cffi/vengine_gen.py -> build/lib.linux-armv7l-3.5/cffi
copying cffi/commontypes.py -> build/lib.linux-armv7l-3.5/cffi
copying cffi/__init__.py -> build/lib.linux-armv7l-3.5/cffi
copying cffi/_cffi_include.h -> build/lib.linux-armv7l-3.5/cffi
copying cffi/parse_c_type.h -> build/lib.linux-armv7l-3.5/cffi
copying cffi/_embedding.h -> build/lib.linux-armv7l-3.5/cffi
copying cffi/_cffi_errors.h -> build/lib.linux-armv7l-3.5/cffi
running build_ext
building '_cffi_backend' extension
creating build/temp.linux-armv7l-3.5
creating build/temp.linux-armv7l-3.5/c
arm-linux-gnueabihf-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -g -fdebug-prefix-map=/build/python3.5-6waWnr/python3.5-3.5.3=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -DUSE__THREAD -DHAVE_SYNC_SYNCHRONIZE -I/usr/include/ffi -I/usr/include/libffi -I/srv/homeassistant/include -I/usr/include/python3.5m -c c/_cffi_backend.c -o build/temp.linux-armv7l-3.5/c/_cffi_backend.o
c/_cffi_backend.c:15:17: fatal error: ffi.h: No such file or directory
#include <ffi.h>
^
compilation terminated.
error: command 'arm-linux-gnueabihf-gcc' failed with exit status 1
----------------------------------------
ERROR: Command "/srv/homeassistant/bin/python3 -u -c 'import setuptools, tokenize;__file__='"'"'/tmp/pip-install-wlsvbm01/cffi/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-0__y3gp_/install-record.txt --single-version-externally-managed --prefix /tmp/pip-build-env-bsn1p3mh/overlay --compile --install-headers /srv/homeassistant/include/site/python3.5/cffi" failed with error code 1 in /tmp/pip-install-wlsvbm01/cffi/
----------------------------------------
ERROR: Command "/srv/homeassistant/bin/python3 /srv/homeassistant/lib/python3.5/site-packages/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-bsn1p3mh/overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple --extra-index-url https://www.piwheels.org/simple -- 'setuptools>=18.5' wheel 'cffi>=1.8,!=1.11.3; python_implementation != '"'"'PyPy'"'"''" failed with error code 1 in None