#### Beyond Linux® From Scratch (System V Edition) - Version r12.2-875

### Chapter 5. File Systems and Disk Management

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# efivar-39

## Introduction to efivar

The efivar package provides tools and libraries to manipulate EFI variables.

### Note

Development versions of BLFS may not build or run some packages properly if LFS or dependencies have been updated since the most recent stable versions of the books.

### Package Information

- Download (HTTP): https://github.com/rhboot/efivar/archive/39/efivar-39.tar.gz

- Download MD5 sum: a8fc3e79336cd6e738ab44f9bc96a5aa

- Download size: 456 KB

- Estimated disk space required: 21 MB

- Estimated build time: less than 0.1 SBU

### efivar Dependencies

#### Recommended

mandoc-1.14.6

## Installation of efivar

### Note

This package cannot function properly on a 32-bit system with a 64-bit UEFI implementation. Don't install this package (or efibootmgr) on 32-bit system unless you are absolutely sure you have a 32-bit UEFI implementation, which is very rare in practice.

Build efivar with the following commands:

    make

The test suite of this package is dangerous. Running it may trigger firmware bugs and make your system unusable without using some special hardware to reprogram the firmware.

Now, as the `root` user:

    make install LIBDIR=/usr/lib

## Command Explanations

`LIBDIR=/usr/lib`: This option overrides the default library directory of the package (`/usr/lib64`, which is not used by LFS).

`ENABLE_DOCS=0`: Disable the generation of man pages. Append this option after the make and make install commands if you don't need the man pages to allow building this package without mandoc-1.14.6 installed.

## Contents

Installed Programs: efisecdb and efivar
Installed Libraries: libefiboot.so, libefisec.so, and libefivar.so
Installed Directories: /usr/include/efivar

### Short Descriptions

efisecdb | is an utility for managing UEFI signature lists
efivar | is a tool to manipulate UEFI variables
`libefiboot.so` | is a library used by efibootmgr
`libefisec.so` | is a library for managing UEFI signature lists
`libefivar.so` | is a library for the manipulation of EFI variables

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