diff --git a/www/mediawiki-CategoryTree/Makefile b/www/mediawiki-CategoryTree/Makefile
new file mode 100644
index 00000000000..88188b9d947
--- /dev/null
+++ b/www/mediawiki-CategoryTree/Makefile
@@ -0,0 +1,34 @@
+# $OpenBSD: Makefile,v 1.1.1.1 2010/04/08 08:03:08 stephan Exp $
+
+COMMENT =	dynamic view of the wiki's category structure as a tree
+
+V =		48711
+DISTNAME =	CategoryTree-MW1.15-r${V}
+PKGNAME =	mediawiki-CategoryTree-${V}
+CATEGORIES =	www
+
+MAINTAINER =	Stephan A. Rickauer <stephan@openbsd.org>
+
+HOMEPAGE =	http://www.mediawiki.org/wiki/Extension:CategoryTree
+MASTER_SITES =	http://upload.wikimedia.org/ext-dist/
+
+# GPLv2
+PERMIT_PACKAGE_CDROM =	Yes
+PERMIT_PACKAGE_FTP =	Yes
+PERMIT_DISTFILES_CDROM =Yes
+PERMIT_DISTFILES_FTP =	Yes
+
+NO_BUILD =	Yes
+NO_REGRESS =	Yes
+PKG_ARCH =	*
+
+PREFIX =	/var/www
+EXTENSIONSDIR =	${PREFIX}/mediawiki/extensions
+
+RUN_DEPENDS =	:mediawiki->=1.15.1:www/mediawiki
+
+do-install:
+	${INSTALL_DATA_DIR} ${EXTENSIONSDIR}/CategoryTree
+	${INSTALL_DATA} ${WRKDIR}/CategoryTree/* ${EXTENSIONSDIR}/CategoryTree/
+
+.include <bsd.port.mk>
diff --git a/www/mediawiki-CategoryTree/distinfo b/www/mediawiki-CategoryTree/distinfo
new file mode 100644
index 00000000000..b1b4aa4138e
--- /dev/null
+++ b/www/mediawiki-CategoryTree/distinfo
@@ -0,0 +1,5 @@
+MD5 (CategoryTree-MW1.15-r48711.tar.gz) = t3IJ0M2g9TOwD72xRy649A==
+RMD160 (CategoryTree-MW1.15-r48711.tar.gz) = 5yEzziW5W0nzS6IgUu1ADmYK8YQ=
+SHA1 (CategoryTree-MW1.15-r48711.tar.gz) = plFtTllA3k6qis4or4ob1TpDfQA=
+SHA256 (CategoryTree-MW1.15-r48711.tar.gz) = 6pa6No+rPziryrEf8JOf7pbvLTIFaVHF7UHsaB71vZA=
+SIZE (CategoryTree-MW1.15-r48711.tar.gz) = 73851
diff --git a/www/mediawiki-CategoryTree/pkg/DESCR b/www/mediawiki-CategoryTree/pkg/DESCR
new file mode 100644
index 00000000000..f081c0bf533
--- /dev/null
+++ b/www/mediawiki-CategoryTree/pkg/DESCR
@@ -0,0 +1,2 @@
+The CategoryTree extension provides a dynamic view of the wiki's category
+structure as a tree. It uses AJAX to load parts of the tree on demand.
diff --git a/www/mediawiki-CategoryTree/pkg/MESSAGE b/www/mediawiki-CategoryTree/pkg/MESSAGE
new file mode 100644
index 00000000000..6843b5df126
--- /dev/null
+++ b/www/mediawiki-CategoryTree/pkg/MESSAGE
@@ -0,0 +1,4 @@
+edit LocalSettings.php and add:
+
+$wgUseAjax = true;
+require_once( 'extensions/CategoryTree/CategoryTree.php' );
diff --git a/www/mediawiki-CategoryTree/pkg/PLIST b/www/mediawiki-CategoryTree/pkg/PLIST
new file mode 100644
index 00000000000..90e1343f2db
--- /dev/null
+++ b/www/mediawiki-CategoryTree/pkg/PLIST
@@ -0,0 +1,14 @@
+@comment $OpenBSD: PLIST,v 1.1.1.1 2010/04/08 08:03:08 stephan Exp $
+mediawiki/extensions/CategoryTree/
+mediawiki/extensions/CategoryTree/CategoryPageSubclass.php
+mediawiki/extensions/CategoryTree/CategoryTree.css
+mediawiki/extensions/CategoryTree/CategoryTree.i18n.php
+mediawiki/extensions/CategoryTree/CategoryTree.js
+mediawiki/extensions/CategoryTree/CategoryTree.php
+mediawiki/extensions/CategoryTree/CategoryTree.rtl.css
+mediawiki/extensions/CategoryTree/CategoryTreeFunctions.php
+mediawiki/extensions/CategoryTree/CategoryTreeIE.css
+mediawiki/extensions/CategoryTree/CategoryTreePage.i18n.alias.php
+mediawiki/extensions/CategoryTree/CategoryTreePage.php
+mediawiki/extensions/CategoryTree/README
+mediawiki/extensions/CategoryTree/install.settings