If you want to build python packages that include both 32 and 64-bit libraries you’ll probably start by reaching for a manylinux docker container. However, you’ll find that while there are manylinux containers with 32-bit toolchains (i686) and for 64-bit ones (x64_64), there aren’t containers that include both. Setting one up for manylinux2014 isn’t too hard, but it’s not trivial or obvious either, so I’ve made this post to walk through it.