ESS version 5.1.4 requires Emacs version 19.29 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

  * R versions >=0.49

  * XLispStat versions >=3.50

  * S4

  * SAS

  * Stata >=6.0

on the following platforms

  * SunOS (all)

  * Solaris (all)

  * SGI (all)

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

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

with the following Emacsen:

  * Emacs 19.29, 19.34, XEmacs 19.16, XEmacs 20.4, XEmacs 21.0

  * Emacs 19.28 with SAS (with additional modifications)

  * NTEmacs 20.3.1 with S-PLUS 4.5.

It may need some work with other configurations.  We include configuration suggestions for emacs 19.28 in Doc/README-19.28. These are the changes we made in order to use ESS with SAS on a Digital Alpha running Emacs 19.28.