Both of these are currently getting a permanent redirect. Applied.
Index: frontends.html =================================================================== RCS file: /cvs/gcc/wwwdocs/htdocs/frontends.html,v retrieving revision 1.37 diff -u -3 -p -r1.37 frontends.html --- frontends.html 28 Jan 2011 19:33:38 -0000 1.37 +++ frontends.html 27 Mar 2013 21:50:18 -0000 @@ -27,10 +27,10 @@ are very mature.</p> <ul> -<li><a href="http://www.gnu-pascal.de/";>GNU Pascal Compiler</a> (GPC).</li> +<li><a href="http://www.gnu-pascal.de/gpc/h-index.html";>GNU Pascal Compiler</a> (GPC).</li> <li><a -href="http://www.mercury.cs.mu.oz.au/download/gcc-backend.html";>Mercury</a>, +href="http://www.mercurylang.org/download/gcc-backend.html";>Mercury</a>, a declarative logic/functional language. The University of Melbourne Mercury compiler is written in Mercury; originally it compiled via C but now it also has a backend that generates assembler directly, using the GCC backend.</li>
