autoconf.texi: Don’t say that Darwin is “derived from FreeBSD.”

This is an oversimplification and is probably going to cause
more confusion than it solves.

The commit which added this text was attributed to Sevan Janiyan,
but the text itself was written by me (Zack Weinberg); I revised
the patch but did not remember to also revise the commit message.

diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index ad46411715bf31fa4f319ecc730cc81c3812bd0e..cb148398e31ab8113ac51829b723f8313fda0f52 100644 (file)
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -15520,14 +15520,12 @@ provides some variants of traditional implementations of Unix utilities.
 Darwin is a partially proprietary operating system maintained by Apple
 Computer and used by most of their products.  It is also known as macOS,
 iOS, etc.@: depending on the exact variant.  Older versions were called
-``Mac OS X'', the X being intended as the Roman numeral for 10.
-
-It is derived from FreeBSD, but presents some unusual portability
-hazards.  Most importantly, by default the filesystem will be case
-insensitive, albeit case preserving.  This can cause nasty problems:
-for instance, the installation attempt for a package having an
-@file{INSTALL} file can result in @samp{make install} reporting that
-nothing is to be done!
+``Mac OS X.''
+
+By default the filesystem will be case insensitive, albeit case
+preserving.  This can cause nasty problems: for instance, the
+installation attempt for a package having an @file{INSTALL} file can
+result in @samp{make install} reporting that nothing is to be done!
 
 Darwin does support case-sensitive file systems, but they must be
 formatted specially as such, and Apple discourages use of a