Circular port dependency

[George Mitchell]

I grabbed the ports tree as of 308518, the RELEASE_9_1_0 tag.
devel/libtool won't build, because it requires autom4te during the
configure phase.  So I put "BUILD_DEPENDS= autom4te:devel/autoconf"
in the Makefile.  But autoconf depends on gmake, which depends on
gettext, which depends on libiconv, which depends on libtool.
What to do?

I'm running on a CURRENT build on my Raspberry Pi.
-- George Mitchell