INSTALLATION ON 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 . For help on which files to download, see the DJGPP "ZIP PICKER" page at . You also need to have the WATT-32 networking package installed before you try to compile OpenSSL. This can be obtained from . 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 .