Apply at 
/usr/ports/japanese/a2ps

--- Makefile.FCS	2013-09-21 03:47:54.000000000 +0900
+++ Makefile	2013-10-22 20:50:04.000000000 +0900
@@ -13,6 +13,7 @@
 MAINTAINER=	hrs@FreeBSD.org
 COMMENT=	Text file to postscript converter (with Japanese support)
 
+USES=		perl5
 LICENSE=	BSD
 
 RUN_DEPENDS=	paperconf:${PORTSDIR}/print/libpaper