. NOPORTDOCS -> PORT_OPTIONS:MDOCS;

. use PLIST_FILES and PORTDOCS;
. remove pkg-plist (4 lines).

biology/ariadne/Makefile

@@ -13,16 +13,23 @@ COMMENT=	Programs to compare protein sequences and profiles
 WRKSRC=		${WRKDIR}/SRC-${PORTVERSION}
 USE_GMAKE=	yes
 
+PLIST_FILES+=	bin/ariadne bin/prospero
+PORTDOCS=	README
+
+OPTIONS_DEFINE=	DOCS
+
 post-patch:
 	@${REINPLACE_CMD} -e 's|-lpthread|${PTHREAD_LIBS}| ; \
 		s|CC =|CC ?=| ; \
 		s|CFLAGS =|CFLAGS +=| ; \
 		s|-c $(OPTIMISE)|-c $(CFLAGS) $(OPTIMIZE)|g' ${WRKSRC}/Makefile
 
+.include <bsd.port.options.mk>
+
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/${OPSYS}/ariadne ${PREFIX}/bin
 	${INSTALL_PROGRAM} ${WRKSRC}/${OPSYS}/prospero ${PREFIX}/bin
-.if !defined(NOPORTDOCS)
+.if ${PORT_OPTIONS:MDOCS}
 	@${MKDIR} ${DOCSDIR}
 	${INSTALL_DATA} ${WRKSRC}/README ${DOCSDIR}
 .endif

biology/ariadne/pkg-plist

@@ -1,4 +0,0 @@
-bin/ariadne
-bin/prospero
-%%PORTDOCS%%%%DOCSDIR%%/README
-%%PORTDOCS%%@dirrm %%DOCSDIR%%