OpenBSD 5.9+ README
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A number of packages has to be installed to satisfy build dependencies.
Let's start with GNU build tools:

# pkg_add autoconf-2.69p2
# pkg_add autogen-5.8.7p4
# pkg_add automake-1.9.6p12
# pkg_add gettext-0.19.7
# pkg_add gmake-4.2.1
# pkg_add libtool-2.4.2p0


Then we have to install client libraries, llvm compiler, and of course git.

# pkg_add wget
# pkg_add json-c-0.12p1 GeoIP rrdtool llvm git


git clone and build
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$ cd /some/path
$ git clone https://github.com/ntopng/ntopng.git
$ cd ntopng
$ git clone https://github.com/ntopng/nDPI.git

$ AUTOCONF_VERSION=2.69 AUTOMAKE_VERSION=1.9 ./autogen.sh
$ AUTOCONF_VERSION=2.69 AUTOMAKE_VERSION=1.9 ./configure
$ gmake
$ gmake geoip
$ gmake install


Redis server and first start
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Before you can launch ntopng, a Redis server has to be installed and started.

# pkg_add redis

Enable and start redis, which will listen on 631/TCP port.

# rcctl enable redis
# rcctl start redis