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From: "Stephen J. Turnbull (turnbull AT sk DOT tsukuba DOT ac DOT jp) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
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Subject: Re: Quant Stuff I'd like to see in djgpp
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vjp2 DOT at AT at DOT BioStrategist DOT dot DOT dot DOT com writes:

 >  My plain text dialup unix isp (and termux unix under android) has
 > non-gui versions of R, Octave and Maxima.

You might want to ask them about how they did it, probably after
asking the upstream projects if they provide a way to disable GUI
features at build time.

 > I am considering learning how to compile them under MSDOS

That is a good question for DJGPP (although these things are very
application-specific, so you'll get faster results if you do as much
as you can and then come ask here -- if you don't, unless there's
somebody who's been thinking about scratching that same itch, you're
just going to be told to try it and tell us what your problems are).

 > and trying to find out how the GUI routines were blocked.

This is application-specific.  Unless you're very lucky and somebody
has already done this (but in that case it would probably be in
contrib already), you should ask the upstream projects.  They probably
have a switch to get you most of the way to the terminal-only
configuration *on a POSIX system*, but it's less and less likely over
time that you'll have out-of-the-box support for DJGPP.

I would start by getting the source code (preferably as $VC repository
clones), and running ./configure --help (or whatever the build
configuration system is) to see if there are switches to disable
inclusion of GUI features.

Good luck, and have fun!

Steve