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Riku Voipio authored
bison/flex is now needed always for building for kconfig. Some build
dependencies depend on kernel configuration, enable them as needed:

- libelf-dev when UNWINDER_ORC is set
- libssl-dev for SYSTEM_TRUSTED_KEYRING

Since the libssl-dev is needed for extract_cert binary, denote with
:native to install the libssl-dev for the build machines architecture,
rather than for the architecture of the kernel being built.

Tested-by: default avatarManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: default avatarRiku Voipio <riku.voipio@linaro.org>
Reviewed-by: default avatarBen Hutchings <ben@decadent.org.uk>
Acked-by: default avatarmaximilian attems <maks@stro.at>
[masahiro.yamada: change 'flex' to 'flex | flex:native' ]
Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
e3a22850
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Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.