Template:Build Documentation 64bit
Advanced users can create 64-bit instead of 32-bit builds.
If you are interested, click on Expand on the right.
By default, 32-bit Linux is used.  64-bit builds are less tested due to a lack of developer manpower, but should work well in principle. Whonix 14 will be 64-bit by default, see: State of official 64-bit builds.
Generally speaking, 64-bit builds cannot be created if running a 32 bit kernel.  In this case, try installing the packages and , then boot the amd64 kernel by choosing it in the boot menu. The whole system does not require re-installation; just be sure to boot with an amd64 kernel.
kFreeBSD is entirely untested and most likely needs additional work (see footnotes). 
Whonix for arm64 development discussion:
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- The kernel is installed, and only for compatibility reasons. Users with modern hardware can omit and those with ancient hardware can omit .
- This only installs the kernel.
--arch amd64, the following is implicitly added (unless settings are manually changed).
--kernel linux-image-amd64 --headers linux-headers-amd64
Lacks --kernel and --headers.