The node.env build environment require npm, ttfautohint and fontforge installed
in the OS. These tools can be installed by::
sudo -H ./utils/searx.sh install buildhost
If one of the tools is not installed, the script node.env stops with a
appropriate message.
BTW: We ignore CentOS-7 as developer & build platform
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>