;; :darwin = We're intended to run under Darwin (including MacOS X).
;; :sunos = We're intended to run under Solaris user environment
;; with the SunOS kernel.
+ ;; :hpux = We're intended to run under HP-UX 11.11 or later
;; :osf1 = We're intended to run under Tru64 (aka Digital Unix
;; aka OSF/1).
;; :win32 = We're intended to under some version of Microsoft Windows.