Index: Mk/bsd.port.mk
===================================================================
RCS file: /home/pcvs/ports/Mk/bsd.port.mk,v
retrieving revision 1.666
diff -u -r1.666 bsd.port.mk
--- Mk/bsd.port.mk	29 Dec 2010 07:14:56 -0000	1.666
+++ Mk/bsd.port.mk	9 Jan 2011 17:43:45 -0000
@@ -1282,6 +1282,10 @@
 UID_OFFSET?=	0
 GID_OFFSET?=	0
 
+# predefined accounts from src/etc/master.passwd
+# alpha numeric sort order
+USERS_BLACKLIST=	_dhcp _pflogd bin bind daemon games kmem mailnull man news nobody operator pop proxy root smmsp sshd toor tty uucp www
+
 LDCONFIG_DIR=	libdata/ldconfig
 LDCONFIG32_DIR=	libdata/ldconfig32
 
@@ -4238,6 +4242,14 @@
 	done
 .endfor
 .endif
+.if defined(USERS)
+.for _user in ${USERS}
+	@if [ ! ${USERS_BLACKLIST:M${_user}} ]; then \
+		${ECHO_CMD} "@unexec if ${PW} usershow ${_user} >/dev/null 2>&1; then \
+		echo \"==> You should manually remove the \\\"${_user}\\\" user. \"; fi" >> ${TMPPLIST}; \
+	fi
+.endfor
+.endif
 .endif
 .else
 	@${DO_NADA}