Template:Build Documentation 64bit
Advanced users can create 64bit instead of 32bit builds.
If you are interested, click on Expand on the right.
By default, Linux 32 bit is used.  64bit builds are less tested due to lack of developer manpower. Should work well in principle. Whonix 14 will be 64 bit by default. Forum discussion: State of offical 64 bit builds
Note, you cannot build 64 bit if you are running a 32 bit kernel.  In that case, try installing the packages linux-image-amd64 and linux-headers-amd64. Then boot that amd64 kernel by choosing it in your boot menu. (This does not require re-installation of the whole system. Just make sure you boot with an amd64 kernel.)
kFreeBSD. entirely untested and most likely needs work. See footnotes. 
Whonix for arm64 development discussion:
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- And kernel is installed. The 486 kernel only gets installed for compatibility reasons. If you have modern hardware, you can omit . Or if you have ancient hardware, you could omit .
- Only installs kernel.
--arch amd64, the following is implicitly added unless you manually set these.
--kernel linux-image-amd64 --headers linux-headers-amd64
Lacks --kernel and --headers.
kFreeBSD 64 bit.
kFreeBSD 32 bit.