This patch modifies the depgraph generation to consider DEPEND in addition to
RDEPEND only if we're not in depclean mode (build-time-only dependencies should
be unmerged in depclean mode) and we want the package to be merged (we don't
need build-time-only dependencies for already installed packages).

Index: emerge
===================================================================
RCS file: /var/cvsroot/gentoo-src/portage/bin/emerge,v
retrieving revision 1.345.2.31
diff -u -r1.345.2.31 emerge
--- emerge	18 May 2005 15:19:52 -0000	1.345.2.31
+++ emerge	21 May 2005 15:41:34 -0000
@@ -1008,7 +1008,11 @@
 		mp=string.join(mybigkey)
 
 		if myroot=="/":
-			mydep["/"]=edepend["DEPEND"]+" "+edepend["RDEPEND"]
+			mydep["/"]=edepend["RDEPEND"]
+			# If we're not in depclean mode and we want the package
+			# to be merged, we also need to consider DEPEND
+			if self.myaction!="depclean" and mybigkey[3]=="merge":
+				mydep["/"]+=" "+edepend["DEPEND"]
 			if not self.select_dep("/",mydep["/"],myparent=mp,myuse=myuse):
 				return 0
 		else: