Index: Mk/Uses/perl5.mk
===================================================================
--- Mk/Uses/perl5.mk
+++ Mk/Uses/perl5.mk
@@ -86,8 +86,11 @@
 PERL_PORT?=	perl5.20
 .elif ${PERL_LEVEL} >= 501800
 PERL_PORT?=	perl5.18
-.else # ${PERL_LEVEL} < 501800
+.elif ${PERL_LEVEL} >= 501600
 PERL_PORT?=	perl5.16
+.else
+PERL_PORT?=	perl5.18
+IGNORE=	Unsupported perl5 version ${PERL_VERSION}
 .endif
 
 SITE_PERL_REL?=	lib/perl5/site_perl