[PATCH] doc: update URLs and references

[Eric Wong <e@80x24.org>]

Neither the GCC nor libatomic_ops URLs are valid, anymore.
Update them to the latest versions and ensure the URLs themselves
are visible in documentation as links to external sites.

Additionally, the current cgit installation on bogomips.org will
soon be replaced by a CSS-free web-based viewer.

Also, correct the reference to "LGPL-2.1+" while we're at it
and add references to the nntp:// mail archives.
---
 .olddoc.yml              |  2 ++
 README                   | 22 +++++++++++++---------
 ext/raindrops/extconf.rb |  2 +-
 3 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/.olddoc.yml b/.olddoc.yml
index 567cef1..7fe7995 100644
--- a/.olddoc.yml
+++ b/.olddoc.yml
@@ -5,3 +5,5 @@ rdoc_url: http://raindrops.bogomips.org/
 public_email: raindrops-public@bogomips.org
 private_email: raindrops@bogomips.org
 ml_url: http://bogomips.org/raindrops-public/
+nntp_url:
+  - nntp://news.public-inbox.org/inbox.comp.lang.ruby.raindrops
diff --git a/README b/README
index 905c44c..6862311 100644
--- a/README
+++ b/README
@@ -37,12 +37,15 @@ and "tcp_diag" kernel modules are loaded as they do not autoload correctly
 
 == Install
 
-We recommend GCC 4+ (or compatible) to support the
-{atomic builtins}[http://gcc.gnu.org/onlinedocs/gcc/Atomic-Builtins.html]
-(__sync_{add,sub}_and_fetch()).  For non-GCC 4+ users, we also support
-compilation with the
-{libatomic_ops}[http://www.hpl.hp.com/research/linux/atomic_ops/]
-package starting with Raindrops 0.4.0.
+We recommend GCC 4+ (or compatible) to support the __sync builtins
+(__sync_{add,sub}_and_fetch()):
+
+	http://gcc.gnu.org/onlinedocs/gcc/_005f_005fsync-Builtins.html
+
+For non-GCC 4+ users, we also support compilation with the libatomic_ops
+package starting with Raindrops 0.4.0:
+
+	https://github.com/ivmai/libatomic_ops
 
 If you're using a packaged Ruby distribution, make sure you have a C
 compiler and the matching Ruby development libraries and headers.
@@ -74,7 +77,7 @@ You can get the latest source via git from the following locations:
 You may browse the code from the web and download the latest snapshot
 tarballs here:
 
-* http://bogomips.org/raindrops.git (cgit)
+* http://bogomips.org/raindrops.git
 * http://repo.or.cz/w/raindrops.git (gitweb)
 
 Inline patches (from "git format-patch") to the mailing list are
@@ -86,13 +89,14 @@ git itself.  See the Documentation/SubmittingPatches document
 distributed with git on on patch submission guidelines to follow.  Just
 don't email the git mailing list or maintainer with raindrops patches.
 
-raindrops is licensed under the LGPL+2.1 or later:
+raindrops is licensed under the LGPL-2.1+
 
 == Contact
 
 All feedback (bug reports, user/development discussion, patches, pull
 requests) go to the mailing list: mailto:raindrops-public@bogomips.org
 
-Mailing list archives are available here:
+Mailing list archives are available over HTTP and NNTP:
 
 http://bogomips.org/raindrops-public/
+nntp://news.public-inbox.org/inbox.comp.lang.ruby.raindrops
diff --git a/ext/raindrops/extconf.rb b/ext/raindrops/extconf.rb
index 74ed8f9..79d212c 100644
--- a/ext/raindrops/extconf.rb
+++ b/ext/raindrops/extconf.rb
@@ -47,7 +47,7 @@
 end or have_header('atomic_ops.h') or abort <<-SRC
 
 libatomic_ops is required if GCC 4+ is not used.
-See http://www.hpl.hp.com/research/linux/atomic_ops/
+See https://github.com/ivmai/libatomic_ops
 
 Users of Debian-based distros may run:
 
-- 
EW