ESS is most likely to work with current/recent versions of the following
statistical packages: R/S-PLUS, SAS, Stata, OpenBUGS and JAGS.

ESS supports current, and recent, stable versions of GNU Emacs
(currently, specifically, the 23.x and 24.x series; alpha/beta/pre-release
versions are NOT SUPPORTED).  Non-Windows users beware: GNU Emacs 24.3 is 
preferable to 24.1 or 24.2: these broken builds suffer from bug 12463 
@uref{http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12463} which 
will cause emacs and ESS to get progressively slower over time.
@c XEmacs currently does not allow all ESS
@c features. Basic ESS functionality however is supported for the time being
@c (XEmacs stable 21.4.14 or higher).

Due to XEmacs lacking some features that ESS requires, ESS
support of XEmacs ends with ESS 12.04-4.  This decision will
be re-visited in the future as XEmacs continues to sync with
GNU Emacs.

To build the PDF documentation, you will need a version of TeX Live or
texinfo that includes texi2dvi (BEWARE: recent TeX Live, and some
texinfo RPMs, do NOT include texi2dvi).

@c ESS has been tested with

@c @itemize @bullet
@c @item R >=0.49
@c @item S-PLUS 3.3-4, 4.5, 2000, 5.0-1, 6.0-2, 7.0, 8.0
@c @item S4
@c @item SAS >=9.1
@c @item BUGS 0.5, 0.6
@c @item JAGS 1.0
@c @item Stata >=10.0 (command line only)
@c @c is anyone still using this? @item XLispStat >=3.50
@c @end itemize

@c on the following platforms

@c @itemize @bullet
@c @item Linux/x86 (all but BUGS)
@c @item Solaris/x86 (all but BUGS and S-PLUS)
@c @c cannot confirm this right now @item SGI (all)
@c @item MS Windows 98/NT/2000/XP (R, S-PLUS, SAS interactive only, and BUGS)
@c @item Apple Mac OS X 10.4-5 (R, JAGS, Stata)
@c @end itemize

@c with the following versions of emacs

@c @itemize @bullet
@c @item GNU Emacs 20.3-7, 21.1, 21.3-4, 22.1
@c @item XEmacs 21.4.0-8, 21.4.9-13@footnote{
@c require the files.el patch to revert-buffer for the Local Variables
@c updating problem}, 21.4.14-15, 21.4.17-22 (betas not supported, but 21.5.23+ may work)
@c @c @item GNU Emacs <20.3 and XEmacs <21.0@footnote{These releases of emacs are no
@c @c longer supported, so an upgrade is recommended if you plan to use ESS.
@c @c If you have GNU Emacs 19.29, see @xref{Unix installation}.  Also, note
@c @c that the `custom' library bundled with Emacs 19.34 is too _old_, its API is
@c @c incompatible with the `new custom' bundled with recent Emacsen.
@c @c The `new custom' for Emacs 19.34 is available for download
@c @c @uref{ftp://ftp.dina.kvl.dk/pub/Staff/Per.Abrahamsen/custom/custom-1.9962.tar.gz, here}.}
@c @end itemize
