The efivar has compilation issues for 32-bit architecture and RISC-V.
For 32 bit architecture I'd assume that it has to do with the issue
mentioned here: https://github.com/rhboot/efivar/issues/270
For RISC-V architecture it errors out due to the `-Werror` flag
and conflicting types as detailed in:
https://github.com/rhboot/efivar/issues/280

The repo for efivar hasn't been updated in over a year so it might need to
be forked if you want a source code solution or we can alter the make flags
to be more permissive.