call xmkmf with -DPorts to make sure we pick up the imake configuration

for ports

graphics/xpaint/patches/patch-Imakefile

@@ -1,6 +1,6 @@
-$OpenBSD: patch-Imakefile,v 1.3 2010/08/23 17:25:47 jasper Exp $
---- Imakefile.orig	Fri Jun  3 14:26:03 2005
-+++ Imakefile	Mon Aug 23 18:37:30 2010
+$OpenBSD: patch-Imakefile,v 1.4 2011/06/23 14:21:14 naddy Exp $
+--- Imakefile.orig	Fri Jun  3 06:26:03 2005
++++ Imakefile	Thu Jun 23 08:12:39 2011
 @@ -97,12 +97,12 @@ XAWDEPENDS = \
  	brushOp.o chroma.o fileName.o fontSelect.o graphic.o help.o \
  	iprocess.o main.o menu.o misc.o operation.o pattern.o print.o size.o
@@ -25,7 +25,7 @@ $OpenBSD: patch-Imakefile,v 1.3 2010/08/23 17:25:47 jasper Exp $
 +	-$(RM) $(XAWDEPENDS) ; ln -sf ${X11BASE}/include/X11/Xaw xaw_incdir
 +	echo "XAWLIB_DEFINES = -DXAWPLAIN" > Local.xawdefs
 +	echo "SYS_LIBRARIES = XawClientLibs -lm" >> Local.xawdefs
-+	xmkmf ; (cd rw ; xmkmf) ; make
++	xmkmf -DPorts ; (cd rw ; xmkmf -DPorts) ; make
  	@echo ""
  	@echo "'xpaint' compiled with Xaw widgets (old and ugly)"
  	@echo "You should rather use Xaw3d, neXtaw or Xaw95 !!"