Building XZ Utils for DOS ========================= Introduction This document explains how to build XZ Utils for DOS using DJGPP. The resulting binaries should run at least on various DOS versions and under Windows 95/98/98SE/ME, although the Windows version of XZ Utils is recommended under Windows 95 and later. This is currently experimental and has got very little testing. Note: Makefile and config.h are updated only now and then. This means that especially if you checked out a development version, building for DOS probably won't work without updating Makefile and config.h first. Getting and Installing DJGPP You may use to help deciding what to download, but as of writing (2010-10-09) that may not be the most convenient way taking into account what components are actually required to build XZ Utils. However, using the zip-picker can still be worth doing to get nice short summary of installation instructions (they can be found from readme.1st too). For a more manual method, first select a mirror from . You need the following files: unzip32.exe (if you don't already have a LFN-capable unzipper) beta/v2/djdev204.zip v2gnu/bnu219b.zip v2gnu/gcc444b.zip v2gnu/mak3791b.zip v2misc/csdpmi7b.zip If newer versions are available, probably you should try them first. Note that djdev203.zip is too old to build XZ Utils; you need at least djdev204.zip. Also note that you want csdpmi7b.zip even if you run under Windows or DOSEMU, because the XZ Utils Makefile will embed cwsdstub.exe to the resulting binaries. See the instructions in readme.1st found from djdev204.zip. Here's a short summary, but you should still read readme.1st. C:\> mkdir DJGPP C:\> cd DJGPP C:\DJGPP> c:\download\unzip32 c:\download\djdev204.zip C:\DJGPP> c:\download\unzip32 c:\download\bnu219b.zip C:\DJGPP> c:\download\unzip32 c:\download\gcc444b.zip C:\DJGPP> c:\download\unzip32 c:\download\mak3791b.zip C:\DJGPP> c:\download\unzip32 c:\download\csdpmi7b.zip C:\DJGPP> set PATH=C:\DJGPP\BIN;%PATH% C:\DJGPP> set DJGPP=C:\DJGPP\DJGPP.ENV You may want to add the last two lines into AUTOEXEC.BAT or have, for example, DJGPP.BAT which you can run before using DJGPP. Make sure you use completely upper case path in the DJGPP environment variable. This is not required by DJGPP, but the XZ Utils Makefile is a bit stupid and expects that everything in DJGPP environment variable is uppercase. Building You need to have an environment that supports long filenames (LFN). Once you have built XZ Utils, the resulting binaries can be run without long filename support. Run "make" in this directory (the directory containing this README). You should get xz.exe (and a bunch of temporary files). Other tools are not built. Having e.g. xzdec.exe doesn't save much space compared to xz.exe, because the DJGPP runtime makes the .exe quite big anyway.