diff --git a/www/p5-RTx-Calendar/Makefile b/www/p5-RTx-Calendar/Makefile
index 0966ab06e1cd..b9361516f469 100644
--- a/www/p5-RTx-Calendar/Makefile
+++ b/www/p5-RTx-Calendar/Makefile
@@ -1,53 +1,64 @@
 # Created by: Matthew Seaman <m.seaman@infracaninophile.co.uk>
 
 PORTNAME=	RTx-Calendar
 PORTVERSION=	1.03
 PORTREVISION=	1
 CATEGORIES=	www perl5
 MASTER_SITES=	CPAN
 PKGNAMEPREFIX=	p5-
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Calendar extension module for the RT ticketing system
 
 LICENSE=	ART10 GPLv1+
 LICENSE_COMB=	dual
 
 BUILD_DEPENDS=	p5-Date-ICal>0:devel/p5-Date-ICal      \
 		p5-Data-ICal>0:deskutils/p5-Data-ICal  \
 		p5-DateTime-Set>0:devel/p5-DateTime-Set \
 		${LOCALBASE}/bin/rt:www/rt${RT_VER}
 RUN_DEPENDS=	p5-Date-ICal>0:devel/p5-Date-ICal      \
 		p5-Data-ICal>0:deskutils/p5-Data-ICal  \
 		p5-DateTime-Set>0:devel/p5-DateTime-Set \
 		${LOCALBASE}/bin/rt:www/rt${RT_VER}
 
-USES=		perl5
-USE_PERL5=	configure
+FLAVOR?=	${FLAVORS:[1]}
+FLAVORS=	rt44 rt50
+rt44_PKGNAMEPREFIX=	p5-RT44-
+rt44_CONFLICTS_INSTALL= rt50
+rt50_PKGNAMEPREFIX=	p5-RT50-
+rt50_CONFLICTS_INSTALL= rt44
 
+.if ${FLAVOR} == rt44
 RT_VER=		44
+.elif ${FLAVOR} == rt50
+RT_VER=		50
+.endif
+
+USES=		perl5
+USE_PERL5=	configure
 
 NO_ARCH=	yes
 
 PLIST_SUB+=	RTHOME=share/rt${RT_VER}
 
 post-patch:
 	@${FIND} ${WRKSRC} -name '*.orig' -delete
 
 # Note: You can install using an arbitrary $PREFIX but only if it
-# matches the $PREFIX used to install www/rt44.  Hence ignore
+# matches the $PREFIX used to install www/rt{44,50}.  Hence ignore
 # $PREFIX in the environment and inherit settings from RT.pm
 do-configure:
 	@cd ${CONFIGURE_WRKSRC} && \
 	    unset PREFIX && \
 	    ${SETENV} ${CONFIGURE_ENV} ${PERL5} -I${SITE_PERL} ${CONFIGURE_CMD} && \
 	    ${PERL5} -pi -e 's/ doc_(perl|site|\$$\(INSTALLDIRS\))_install$$//' Makefile
 
 post-configure:
 	${REINPLACE_CMD} "/RTxPlugin/d" ${WRKSRC}/Makefile
 
 post-install:
 	${RM} ${STAGEDIR}${PREFIX}/man/auto/RTx/Calendar/.packlist
 	${RMDIR} -p ${STAGEDIR}${PREFIX}/man/auto/RTx/Calendar 2>/dev/null || :
 
 .include <bsd.port.mk>