README
1
2XZ Utils on DOS
3===============
4
5Introduction
6
7 This document explains how to build XZ Utils for DOS using DJGPP.
8 The resulting binaries should run at least on various DOS versions
9 and under Windows 95/98/98SE/ME, although the Windows version of
10 XZ Utils is recommended under Windows 95 and later.
11
12 This is currently experimental and has got very little testing.
13
14 Note: Makefile and config.h are updated only now and then. This
15 means that especially if you checked out a development version,
16 building for DOS probably won't work without updating Makefile
17 and config.h first.
18
19
20Getting and Installing DJGPP
21
22 You may use <http://www.delorie.com/djgpp/zip-picker.html> to help
23 deciding what to download, but as of writing (2010-10-09) that may
24 not be the most convenient way taking into account what components
25 are actually required to build XZ Utils. However, using the
26 zip-picker can still be worth doing to get nice short summary of
27 installation instructions (they can be found from readme.1st too).
28
29 For a more manual method, first select a mirror from
30 <http://www.delorie.com/djgpp/getting.html>. You need
31 the following files:
32
33 unzip32.exe (if you don't already have a LFN-capable unzipper)
34 beta/v2/djdev204.zip
35 v2gnu/bnu219b.zip
36 v2gnu/gcc444b.zip
37 v2gnu/mak3791b.zip
38 v2misc/csdpmi7b.zip
39
40 If newer versions are available, probably you should try them first.
41 Note that djdev203.zip is too old to build XZ Utils; you need at
42 least djdev204.zip. Also note that you want csdpmi7b.zip even if you
43 run under Windows or DOSEMU, because the XZ Utils Makefile will embed
44 cwsdstub.exe to the resulting binaries.
45
46 See the instructions in readme.1st found from djdev204.zip. Here's
47 a short summary, but you should still read readme.1st.
48
49 C:\> mkdir DJGPP
50 C:\> cd DJGPP
51 C:\DJGPP> c:\download\unzip32 c:\download\djdev204.zip
52 C:\DJGPP> c:\download\unzip32 c:\download\bnu219b.zip
53 C:\DJGPP> c:\download\unzip32 c:\download\gcc444b.zip
54 C:\DJGPP> c:\download\unzip32 c:\download\mak3791b.zip
55 C:\DJGPP> c:\download\unzip32 c:\download\csdpmi7b.zip
56
57 C:\DJGPP> set PATH=C:\DJGPP\BIN;%PATH%
58 C:\DJGPP> set DJGPP=C:\DJGPP\DJGPP.ENV
59
60 You may want to add the last two lines into AUTOEXEC.BAT or have,
61 for example, DJGPP.BAT which you can run before using DJGPP.
62
63 Make sure you use completely upper case path in the DJGPP environment
64 variable. This is not required by DJGPP, but the XZ Utils Makefile is
65 a bit stupid and expects that everything in DJGPP environment variable
66 is uppercase.
67
68
69Building
70
71 You need to have an environment that supports long filenames (LFN).
72 Once you have built XZ Utils, the resulting binaries can be run
73 without long filename support.
74
75 Run "make" in this directory (the directory containing this README).
76 You should get xz.exe (and a bunch of temporary files). Other tools
77 are not built. Having e.g. xzdec.exe doesn't save much space compared
78 to xz.exe, because the DJGPP runtime makes the .exe quite big anyway.
79
80
81Bugs
82
83 xz doesn't necessarily work in Dosbox. It should work in DOSEMU.
84
85 Pressing Ctrl-c or Ctrl-Break won't remove the incomplete target file
86 when running under Windows XP Command Prompt (something goes wrong
87 with SIGINT handling). It works correctly under Windows 95/98/98SE/ME.
88
89