When building ufw on kirkstone, if the build host does not have iptables installed, the following error occurs:

ERROR: ufw-0.36.1-r0 do_compile: 'python3 setup.py build ' execution failed.
Log data follows:
| DEBUG: Executing shell function do_compile
| ERROR: could not find required binary 'iptables'
| ERROR: 'python3 setup.py build ' execution failed.
ERROR: Task ([snip]/meta-openembedded/meta-networking/recipes-connectivity/ufw/ufw_0.36.1.bb:do_compile) failed with exit code '1'

The problem is that the variables DISTUTILS_BUILD_ARGS and DISTUTILS_INSTALL_ARGS were not renamed to SETUPTOOLS_BUILD_ARGS and SETUPTOOLS_INSTALL_ARGS when this recipe was switched to use setuptools3_legacy instead of distutils earlier this year.

I have submitted a fix to master in PR #609 . However, this needs to be added to the kirkstone branch also. Thanks.