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Notes for the DOS platform with DJGPP
=====================================
OpenSSL has been ported to DJGPP, a Unix look-alike 32-bit run-time
environment for 16-bit DOS, but only with long filename support.
If you wish to compile on native DOS with 8+3 filenames, you will
have to tweak the installation yourself, including renaming files
with illegal or duplicate names.
You should have a full DJGPP environment installed, including the
latest versions of DJGPP, GCC, BINUTILS, BASH, etc. This package
requires that PERL and the PERL module `Text::Template` also be
installed (see [NOTES-PERL.md](NOTES-PERL.md)).
All of these can be obtained from the usual DJGPP mirror sites or
directly at <http://www.delorie.com/pub/djgpp>. For help on which
files to download, see the DJGPP "ZIP PICKER" page at
<http://www.delorie.com/djgpp/zip-picker.html>. You also need to have
the WATT-32 networking package installed before you try to compile
OpenSSL. This can be obtained from <http://www.watt-32.net/>.
The Makefile assumes that the WATT-32 code is in the directory
specified by the environment variable WATT_ROOT. If you have watt-32
in directory `watt32` under your main DJGPP directory, specify
`WATT_ROOT="/dev/env/DJDIR/watt32"`.
To compile OpenSSL, start your BASH shell, then configure for DJGPP by
running `./Configure` with appropriate arguments:
./Configure no-threads --prefix=/dev/env/DJDIR DJGPP
And finally fire up `make`. You may run out of DPMI selectors when
running in a DOS box under Windows. If so, just close the BASH
shell, go back to Windows, and restart BASH. Then run `make` again.
RUN-TIME CAVEAT LECTOR
--------------
Quoting FAQ:
"Cryptographic software needs a source of unpredictable data to work
correctly. Many open source operating systems provide a "randomness
device" (`/dev/urandom` or `/dev/random`) that serves this purpose."
As of version 0.9.7f DJGPP port checks upon `/dev/urandom$` for a 3rd
party "randomness" DOS driver. One such driver, `NOISE.SYS`, can be
obtained from <http://www.rahul.net/dkaufman/index.html>.
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