diff -ruN /usr/ports/converters/p5-Convert-UUlib/Makefile ./Makefile
--- /usr/ports/converters/p5-Convert-UUlib/Makefile	2013-11-01 23:20:56.000000000 +0900
+++ ./Makefile	2013-11-06 10:39:25.000000000 +0900
@@ -16,7 +16,9 @@
 USES=		perl5
 USE_PERL5=	configure

-.if !defined(NOPORTDOCS)
+.include <bsd.port.pre.mk>
+
+.if ${PORT_OPTIONS:MDOCS}
 PORTDOCS=	Changes README

 post-install: