build.rs should use $OCTAVE and $OCTAVEBUILD

[ctaggart]

Instructions and getting and building Octave would be useful. Their should probably be environments to set the source directory for Ocatave as well as a separate build directory.

Installing Octave Dependencies on Ubuntu

switch to root

sudo -u root -i

edit sources.list and enable all deb-src

nano /etc/apt/sources.list

apt-get update
apt-get build-dep -y octave
apt-get install -y bison sed

see what is installed

apt-cache show octave

Download & build Octave from source

curl -L -o octave.tar.xz http://ftp.gnu.org/gnu/octave/octave-4.2.1.tar.xz
mkdir octave
tar xf octave.tar.xz -C octave --strip-components 1

It takes about an hour on my VM to build.

mkdir octave-build
cd octave-build
../octave/configure
time make

[ctaggart]

Once I get it working on any platform, let's revisit.