platforms that predate POSIX 1003.1-2001.
Currently we assume at least a freestanding C89 compiler, possibly
-operating with a C library that predates C89. The oldest environment
+operating with a C library that predates C89. The oldest environments
currently ported to are probably HP-UX 10.20 and IRIX 5.3, though we
-are not testing these platform very often.
+are not testing these platforms very often.
Because we assume a freestanding C89 compiler, Gnulib code can include
<float.h>, <limits.h>, <stdarg.h>, and <stddef.h> unconditionally. It