<!ENTITY url.boost.getting.started "http://www.boost.org/more/getting_started.html">
<!ENTITY url.boost.compilers.status "http://www.boost.org/status/compiler_status.html">
<!ENTITY url.openssl "http://www.openssl.org/">
+<!ENTITY url.gnutls "http://www.gnu.org/software/gnutls/">
<!ENTITY url.unxutils "http://unxutils.sourceforge.net/">
<!ENTITY url.tcpwrapper "ftp://ftp.porcupine.org/pub/security/index.html">
<!ENTITY url.openbsd "http://www.openbsd.org/">
<!ENTITY url.ubuntu "http://www.ubuntu.com/">
<!ENTITY url.docbook "http://docbook.org/">
-<!ENTITY url.usemarcon "http://www.bl.uk/services/bibliographic/usemarcon.html">
+<!ENTITY url.usemarcon "http://www.bl.uk/bibliographic/usemarcon.html">
<!ENTITY url.libpcap "http://www.tcpdump.org/">