| 1 | Notes for the DOS platform with DJGPP
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| 2 | =====================================
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| 3 |
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| 4 | OpenSSL has been ported to DJGPP, a Unix look-alike 32-bit run-time
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| 5 | environment for 16-bit DOS, but only with long filename support.
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| 6 | If you wish to compile on native DOS with 8+3 filenames, you will
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| 7 | have to tweak the installation yourself, including renaming files
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| 8 | with illegal or duplicate names.
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| 9 |
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| 10 | You should have a full DJGPP environment installed, including the
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| 11 | latest versions of DJGPP, GCC, BINUTILS, BASH, etc. This package
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| 12 | requires that PERL and the PERL module `Text::Template` also be
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| 13 | installed (see [NOTES-PERL.md](NOTES-PERL.md)).
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| 14 |
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| 15 | All of these can be obtained from the usual DJGPP mirror sites or
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| 16 | directly at <http://www.delorie.com/pub/djgpp>. For help on which
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| 17 | files to download, see the DJGPP "ZIP PICKER" page at
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| 18 | <http://www.delorie.com/djgpp/zip-picker.html>. You also need to have
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| 19 | the WATT-32 networking package installed before you try to compile
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| 20 | OpenSSL. This can be obtained from <http://www.watt-32.net/>.
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| 21 | The Makefile assumes that the WATT-32 code is in the directory
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| 22 | specified by the environment variable WATT_ROOT. If you have watt-32
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| 23 | in directory `watt32` under your main DJGPP directory, specify
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| 24 | `WATT_ROOT="/dev/env/DJDIR/watt32"`.
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| 25 |
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| 26 | To compile OpenSSL, start your BASH shell, then configure for DJGPP by
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| 27 | running `./Configure` with appropriate arguments:
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| 28 |
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| 29 | ./Configure no-threads --prefix=/dev/env/DJDIR DJGPP
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| 30 |
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| 31 | And finally fire up `make`. You may run out of DPMI selectors when
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| 32 | running in a DOS box under Windows. If so, just close the BASH
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| 33 | shell, go back to Windows, and restart BASH. Then run `make` again.
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| 34 |
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| 35 | RUN-TIME CAVEAT LECTOR
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| 36 | --------------
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| 37 |
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| 38 | Quoting FAQ:
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| 39 |
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| 40 | "Cryptographic software needs a source of unpredictable data to work
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| 41 | correctly. Many open source operating systems provide a "randomness
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| 42 | device" (`/dev/urandom` or `/dev/random`) that serves this purpose."
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| 43 |
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| 44 | As of version 0.9.7f DJGPP port checks upon `/dev/urandom$` for a 3rd
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| 45 | party "randomness" DOS driver. One such driver, `NOISE.SYS`, can be
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| 46 | obtained from <http://www.rahul.net/dkaufman/index.html>.
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