docs: README: add TeX font package required for building PDF

The fncychap.sty font needs to be installed on the host in order to be
able to build the PDF version of the docs, so let's mention it in the
README.

Cc: Quentin Schulz <foss+yocto@0leil.net>
(From yocto-docs rev: 97fb41801fb7ac1439f8af03d2da2fb2f171a7e6)

Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/documentation/README b/documentation/README
index 6f6a8ec842..6333f0496a 100644
--- a/documentation/README
+++ b/documentation/README
@@ -129,6 +129,10 @@ Also install the "inkscape" package from your distribution.
 Inkscape is need to convert SVG graphics to PNG (for EPUB
 export) and to PDF (for PDF export).
 
+Additionally install "fncychap.sty" TeX font if you want to build PDFs. Debian
+and Ubuntu have it in "texlive-latex-extra" package while RedHat distributions
+and OpenSUSE have it in "texlive-fncychap" package for example.
+
 To build the documentation locally, run:
 
  $ cd documentation