* doc/autoconf.texi (Introduction, Pointers): Use `@/' liberally
	in URLs to improve DVI formatted output (requires texinfo 4.6).
	(System Services, Systemology, Shellology): Likewise.
	(Limitations of Usual Tools): Rewrite Mac OS X example for nicer
	output.

Index: doc/autoconf.texi
===================================================================
RCS file: /cvsroot/autoconf/autoconf/doc/autoconf.texi,v
retrieving revision 1.1000
diff -u -r1.1000 autoconf.texi
--- doc/autoconf.texi	24 Apr 2006 19:36:01 -0000	1.1000
+++ doc/autoconf.texi	25 Apr 2006 17:07:07 -0000
@@ -681,7 +681,7 @@
 current @acronym{CVS} version can be sent for review to the
 @email{autoconf-patches@@gnu.org, Autoconf Patches mailing list}.
 Past patches are
address@hidden://lists.gnu.org/archive/html/autoconf-patches/, archived}.
address@hidden://lists.gnu.org/@/archive/@/html/@/autoconf-patches/, archived}.
 
 Because of its mission, the Autoconf package itself
 includes only a set of often-used
@@ -829,10 +829,10 @@
 @item Web
 
 The home pages for
address@hidden://www.gnu.org/software/autoconf/, Autoconf},
address@hidden://www.gnu.org/software/automake/, Automake},
address@hidden://www.gnu.org/software/gnulib/, Gnulib}, and
address@hidden://www.gnu.org/software/libtool/, Libtool}.
address@hidden://www.gnu.org/@/software/@/autoconf/, Autoconf},
address@hidden://www.gnu.org/@/software/@/automake/, Automake},
address@hidden://www.gnu.org/@/software/@/gnulib/, Gnulib}, and
address@hidden://www.gnu.org/@/software/@/libtool/, Libtool}.
 
 @item Automake Manual
 
@@ -846,7 +846,7 @@
 by G. V. Vaughan, B. Elliston, T. Tromey, and I. L. Taylor.  SAMS (originally
 New Riders), 2000, ISBN 1578701902.} describes the complete @acronym{GNU}
 build environment.  You can also find
address@hidden://sources.redhat.com/autobook/, the entire book on-line}.
address@hidden://sources.redhat.com/@/autobook/, the entire book on-line}.
 
 @end itemize
 
@@ -6889,7 +6889,7 @@
 @cindex Large file support
 @cindex LFS
 Arrange for
address@hidden://www.unix-systems.org/version2/whatsnew/lfs20mar.html,
address@hidden://www.unix-systems.org/@/version2/@/whatsnew/@/lfs20mar.html,
 large-file support}.  On some hosts, one must use special compiler
 options to build programs that can access large files.  Append any such
 options to the output variable @code{CC}.  Define
@@ -7786,7 +7789,7 @@
 
 @item Tru64
 @cindex Tru64
address@hidden://h30097.www3.hp.com/docs/,
address@hidden://h30097.www3.hp.com/@/docs/,
 Documentation of several versions of Tru64} is available in different
 formats.
 
@@ -10516,7 +10519,7 @@
 There are several families of shells, most prominently the Bourne family
 and the C shell family which are deeply incompatible.  If you want to
 write portable shell scripts, avoid members of the C shell family.  The
address@hidden://www.faqs.org/faqs/unix-faq/shell/shell-differences/, the
address@hidden://www.faqs.org/@/faqs/@/unix-faq/@/shell/@/shell-differences/, the
 Shell difference FAQ} includes a small history of Posix shells, and a
 comparison between several of them.
 
@@ -12785,9 +12788,13 @@
 @command{expr} fails.
 
 On Mac OS X 10.4, @command{expr} mishandles the pattern @samp{[^-]} in
-some cases.  For example, the command @samp{expr
-Xpowerpc-apple-darwin8.1.0 : 'X[^-]*-[^-]*-\(.*\)'} outputs
address@hidden rather than the correct @samp{darwin8.1.0}.
+some cases.  For example, the command
address@hidden
+expr Xpowerpc-apple-darwin8.1.0 : 'X[^-]*-[^-]*-\(.*\)'
address@hidden example
+
address@hidden
+outputs @samp{apple-darwin8.1.0} rather than the correct @samp{darwin8.1.0}.
 This particular case can be worked around by substituting @samp{[^--]}
 for @samp{[^-]}.