Follow the makewhatis(8) switch (s/whatis\.db/mandoc\.db/).

ok espie@, naddy said he did the same changes.

infrastructure/mk/bsd.port.mk

@@ -1,6 +1,6 @@
 #-*- mode: Makefile; tab-width: 4; -*-
 # ex:ts=4 sw=4 filetype=make:
-#	$OpenBSD: bsd.port.mk,v 1.1262 2014/04/15 08:52:35 ajacoutot Exp $
+#	$OpenBSD: bsd.port.mk,v 1.1263 2014/04/18 21:14:20 kili Exp $
 #
 #	bsd.port.mk - 940820 Jordan K. Hubbard.
 #	This file is in the public domain.
@@ -166,7 +166,7 @@ PACKAGE_REPOSITORY ?= ${PORTSDIR}/packages
 PORTS_BUILD_XENOCARA_TOO ?= No
 
 .if ${PORTS_BUILD_XENOCARA_TOO:L} == "no"
-.  if !exists(${X11BASE}/man/whatis.db)
+.  if !exists(${X11BASE}/man/mandoc.db)
 ERRORS += "Fatal: building ports requires correctly installed X11"
 .  endif
 .endif
@@ -2233,7 +2233,7 @@ port-lib-depends-check: ${WRKINST}/.saved_libs
 _internal-manpages-check: ${_FAKE_COOKIE}
 	@cd ${WRKINST}${TRUEPREFIX}/man && \
 		${SUDO} /usr/libexec/makewhatis -p . && \
-		cat whatis.db
+		cat mandoc.db
 
 # Most standard port targets create a cookie to avoid being re-run.
 #