Index: head/Mk/bsd.sanity.mk
===================================================================
--- head/Mk/bsd.sanity.mk
+++ head/Mk/bsd.sanity.mk
@@ -7,6 +7,15 @@
 WARNING+=	"WITHOUT_NLS is deprecated use OPTIONS_UNSET=NLS instead"
 .endif
 
+.if defined(PKGORIGIN)
+.for _c in ${CATEGORIES}
+_CAT?=	${_c}
+.endfor
+.if ${.CURDIR:H:T} != ${_CAT}
+DEV_ERROR+=	"The first entry in CATEGORIES should be the directory where the port lives"
+.endif
+.endif
+
 #.if defined(WITHOUT_X11)
 #WARNING+=	"WITHOUT_X11 is deprecated use X11 option instead"
 #.endif