diff -Nur /usr/ports/www/p5-RT-Extension-SLA/Makefile p5-RT-Extension-SLA/Makefile
--- /usr/ports/www/p5-RT-Extension-SLA/Makefile	2009-07-31 14:56:33.000000000 +0100
+++ p5-RT-Extension-SLA/Makefile	2009-12-29 16:42:49.000000000 +0000
@@ -18,27 +18,11 @@
 BUILD_DEPENDS=	${SITE_PERL}/Business/Hours.pm:${PORTSDIR}/misc/p5-Business-Hours
 RUN_DEPENDS=	${BUILD_DEPENDS}
 
-OPTIONS=	RT36 "Install for rt-3.6.x (default rt-3.8.x)" off
-
 PERL_CONFIGURE=	yes
 
-MAN3=		RT::Action::SLA.3                     \
-		RT::Action::SLA_SetDefault.3          \
-		RT::Action::SLA_SetDue.3              \
-		RT::Action::SLA_SetStarts.3           \
-		RT::Condition::SLA.3                  \
-		RT::Condition::SLA_RequireDefault.3   \
-		RT::Condition::SLA_RequireDueSet.3    \
-		RT::Condition::SLA_RequireStartsSet.3 \
-		RT::Extension::SLA.3                  \
-		RT::Queue_SLA.3
-
-PLIST_SUB+=	RTHOME=${RTHOME}
-
-SUB_LIST+=	RTHOME=${RTHOME}
-SUB_FILES+=	pkg-message
+OPTIONS=	RT36 "Install for rt-3.6.x (default rt-3.8.x)" off
 
-.include <bsd.port.pre.mk>
+.include <bsd.port.options.mk>
 
 .if defined(WITH_RT36)
 
@@ -60,15 +44,31 @@
 
 .endif
 
-# Don't use normal CONFIGURE_ARGS.  Disable doc_?????_indstall targets to
-# suppress installing perllocal.pod.  This duplicates code from bsd.perl.mk
-# rather undesirably.
+MAN3=		RT::Action::SLA.3                     \
+		RT::Action::SLA_SetDefault.3          \
+		RT::Action::SLA_SetDue.3              \
+		RT::Action::SLA_SetStarts.3           \
+		RT::Condition::SLA.3                  \
+		RT::Condition::SLA_RequireDefault.3   \
+		RT::Condition::SLA_RequireDueSet.3    \
+		RT::Condition::SLA_RequireStartsSet.3 \
+		RT::Extension::SLA.3                  \
+		RT::Queue_SLA.3
+
+PLIST_SUB+=	RTHOME=${RTHOME}
+
+SUB_LIST+=	RTHOME=${RTHOME}
+SUB_FILES+=	pkg-message
+
+# Note: You can install using an arbitrary $PREFIX but only if it
+# matches the $PREFIX used to install www/rt3{6,8}.  Hence ignore
+# $PREFIX in the environment and inherit settings from RT.pm
 do-configure:
 	@cd ${CONFIGURE_WRKSRC} && \
-	    ${SETENV} ${CONFIGURE_ENV} ${PERL5} -I${RT_PM_DIR} ./${CONFIGURE_SCRIPT} && \
+	    ${SETENV} -u PREFIX ${CONFIGURE_ENV} ${PERL5} -I${RT_PM_DIR} ./${CONFIGURE_SCRIPT} && \
 	    ${PERL5} -pi -e 's/ doc_(perl|site|\$$\(INSTALLDIRS\))_install$$//' Makefile
 
 post-install:
 	${CAT} ${PKGMESSAGE}
 
-.include <bsd.port.post.mk>
+.include <bsd.port.mk>