diff --git a/lang/xotcl/Makefile b/lang/xotcl/Makefile
index 7d954feec393..1a7cedda75d1 100644
--- a/lang/xotcl/Makefile
+++ b/lang/xotcl/Makefile
@@ -6,7 +6,7 @@
 #
 
 PORTNAME=	xotcl
-PORTVERSION=	1.5.2
+PORTVERSION=	1.5.3
 CATEGORIES=	lang tcl83 tcl84
 MASTER_SITES=	http://media.wu-wien.ac.at/download/
 
@@ -23,6 +23,7 @@ USE_GMAKE=	yes
 PLIST_SUB+=	PORTVERSION=${PORTVERSION}
 
 OPTIONS=	AOLSERVER	"AOL server module"		off \
+		THREADS		"Force threaded build"		off \
 		TUTORIAL	"Install XOTcl tutorial" 	off
 
 CONFIGURE_ARGS+=	--exec-prefix=${PREFIX} \
@@ -48,6 +49,14 @@ PLIST_SUB+=	TUTORIAL=""
 PLIST_SUB+=	TUTORIAL="@comment "
 .endif
 
+.if defined(WITH_THREADS)
+TCL_THREADED!=	${ECHO_EMD} 'puts [array names tcl_platform -exact threaded]' | ${TCLSH}
+.if empty(TCL_THREADED)
+IGNORE=		WITH_THREADS option is selected. You need Tcl with threads to use this port. Please install Tcl with WITH_THREADS defined or from lang/tcl84-thread port and try again.
+.endif
+CONFIGURE_ARGS+=	--enable-threads
+.endif
+
 INSTALL_TARGET+=	install-shells
 .if !defined(NO_INSTALL_MANPAGES)
 MAN1=			xotclsh.1
diff --git a/lang/xotcl/distinfo b/lang/xotcl/distinfo
index 12320dbef467..d06dbdf3857b 100644
--- a/lang/xotcl/distinfo
+++ b/lang/xotcl/distinfo
@@ -1,3 +1,3 @@
-MD5 (xotcl-1.5.2.tar.gz) = c08ec454d140a305d5b8951e3328769e
-SHA256 (xotcl-1.5.2.tar.gz) = 0d5df219e2ee927ef60722d6a2488ee75b7453eee6a2100615a237266b813b0e
-SIZE (xotcl-1.5.2.tar.gz) = 1845603
+MD5 (xotcl-1.5.3.tar.gz) = ed246596550812375ff4461c07b89bcb
+SHA256 (xotcl-1.5.3.tar.gz) = f2393a1a3dc81509215a5ab1548b063a1dd60423a331eae3c106b0a38b85f4ae
+SIZE (xotcl-1.5.3.tar.gz) = 1961146
diff --git a/lang/xotcl/pkg-plist b/lang/xotcl/pkg-plist
index 44e5d5e89982..a418f8beb63d 100644
--- a/lang/xotcl/pkg-plist
+++ b/lang/xotcl/pkg-plist
@@ -96,6 +96,7 @@ lib/xotcl%%PORTVERSION%%/xotclConfig.sh
 %%PORTDOCS%%%%DOCSDIR%%/announces/Announce-1.5.0
 %%PORTDOCS%%%%DOCSDIR%%/announces/Announce-1.5.1
 %%PORTDOCS%%%%DOCSDIR%%/announces/Announce-1.5.2
+%%PORTDOCS%%%%DOCSDIR%%/announces/Announce-1.5.3
 %%TUTORIAL%%%%EXAMPLESDIR%%/tutorial/html/JufGdbmStorage-xotcl.html
 %%TUTORIAL%%%%EXAMPLESDIR%%/tutorial/html/MemStorage-xotcl.html
 %%TUTORIAL%%%%EXAMPLESDIR%%/tutorial/html/MultiStorage-xotcl.html