semweb and http compile now (but they don't work properly yet).

packages/semweb/README

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+---+ SWI-Prolog Semantic Web Library
+
+---++ Abstract
+
+The semweb library provides a Prolog   library based on foreign-language
+extensions for storing and manipulating RDF triples. It can handle quite
+large sets of triples only  limited   by  available  memory. One million
+triples requires about 80MB memory, so   a  fully equiped 32-bit machine
+can handle about 25 million triples. A   64-bit machine with 32Gb memory
+(just a few thousand euros in june 2009)   can  handle up to 150 million
+triples.
+
+
+---++ Prerequisites
+
+This library depends on the RDF parser  library which in turn depends on
+the XML parser provided by the sgml package.
+
+
+---++ Further info
+
+This library defines the semantic web infrastructure for SWI-Prolog. The
+library is documented in semweb.pdf or   the  equivalent semweb.html. If
+your  installation  does   not   include    this   file,   please  visit
+http://www.swi-prolog.org/packages/
+
+
+---++ Staying up-to-date
+
+This library is under active  development.   The  recent  version can be
+accessed from the GIT repository under the directory pl/packages/semweb.
+See http://www.swi-prolog.org/git.html for details on   the  central GIT
+repository and instructions for browsing the repository online.