error while creating pdf using pandoc

I am trying to make pdf from github.com/progit,
get following error:

Code:

---

en:
        Parsing markdown... done
        Creating main.tex for en... done
        Running XeTeX:
                Pass 1... failed with:
                        ! I can't find file `Helvetica'.
        Consider running this again with --debug.

---

do I need to install extra fonts ?
Tried even with latest pandoc from SID.

You should read the page I can't find file `Helvetica'

If you use the Knoppix 7.2.0 DVD you can try the following commands in an LXTerminal.

Code:

---

mkdir -p /home/knoppix/git
cd /home/knoppix/git
GIT_SSL_NO_VERIFY=true git clone https://github.com/progit/progit.git
cd progit
sudo apt-get update
sudo apt-get install -t unstable pandoc
sudo apt-get install ruby-rdiscount rubygems calibre
leafpad latex/config.yml

---

Use existing fonts:

Code:

---

font: TeXGyreHeros Regular
bold: TeXGyreHeros Bold
mono: DejaVuSansMono

---

Save the file and exit leafpad. Now you should be ready to create the PDF file.

Code:

---

./makepdfs en

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Of course, you can use other fonts, but they must be installed on your system.

Thanks, that helped.
I should have checked progit/issues,
but then would have got stuck in figuring out the right config :-)