ESS version 5.1.n (n >= 2) requires Emacs version 19.34 (if you have Emacs 19.29, you may get it to work after unpacking 19.29.tar.gz, see the installation instructions) or later, or version XEmacs 19.14 or later.  It has been most thoroughly tested with:

  * S-PLUS versions 3.3, 3.4, 4.5, 5.0, 5.1, 6

  * R versions >=0.49

  * XLispStat versions >=3.50

  * S4

  * SAS

  * Stata >=6.0

  * BUGS 0.5 or 0.6

on the following platforms

  * SunOS (all)

  * Solaris (all)

  * SGI (all)

  * Linux (S-PLUS 5.0, 5.1, R, XLispStat, S4, Stata 6.0)

  * Microsoft Windows 95/98/NT (SPLUS 4.5 and 2000)

with the following versions of emacs

  * Emacs 19.34, 20.3, 20.4, 20.5, 20.6, 20.7

  * XEmacs 19.16, 20.0, 20.4, 21.0, 21.1.13, 21.4.x

  * Emacs 19.28, 19.29 with SAS (with additional modifications)

  * NTEmacs 20.3.1 with S-PLUS 4.5.