[dpdk-stable] [PATCH 2/3] doc: fix PDF with greek letter

[Thomas Monjalon]

For an unknown reason, the sign "μ" is not accepted by some environments,
probably due to the version of some Latex packages or dependencies.

	! Package inputenc Error: Unicode character μ (U+03BC)
	(inputenc)                not set up for use with LaTeX.

It is fixed by installing texlive-langgreek.

Fixes: d0dff9ba445e ("doc: sample application user guide")
Cc: stable at dpdk.org

Signed-off-by: Thomas Monjalon <thomas at monjalon.net>
---
 doc/guides/conf.py                        | 1 +
 doc/guides/contributing/documentation.rst | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/doc/guides/conf.py b/doc/guides/conf.py
index 6d5001a07..94b97dc35 100644
--- a/doc/guides/conf.py
+++ b/doc/guides/conf.py
@@ -64,6 +64,7 @@
 custom_latex_preamble = r"""
 \usepackage[utf8]{inputenc}
 \usepackage[T1]{fontenc}
+\usepackage{textalpha}
 \usepackage{helvet}
 \renewcommand{\familydefault}{\sfdefault}
 \RecustomVerbatimEnvironment{Verbatim}{Verbatim}{xleftmargin=5mm}
diff --git a/doc/guides/contributing/documentation.rst b/doc/guides/contributing/documentation.rst
index 9d381919b..27e4b13be 100644
--- a/doc/guides/contributing/documentation.rst
+++ b/doc/guides/contributing/documentation.rst
@@ -199,10 +199,10 @@ The main required packages can be installed as follows:
 .. code-block:: console
 
    # Ubuntu/Debian.
-   sudo apt-get -y install texlive-latex-extra
+   sudo apt-get -y install texlive-latex-extra texlive-lang-greek
 
    # Red Hat/Fedora, selective install.
-   sudo dnf     -y install texlive-collection-latexextra
+   sudo dnf     -y install texlive-collection-latexextra texlive-greek-fontenc
 
 `Latexmk <http://personal.psu.edu/jcc8/software/latexmk-jcc/>`_ is a perl script
 for running LaTeX for resolving cross references,
-- 
2.21.0