This was now pulling pkgconfig into my targets.
Package-Manager: Portage-2.3.41, Repoman-2.3.9
KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~ia64 ~ppc ~ppc64 ~sparc ~x86 ~amd64-linux ~arm-linux ~x86-linux ~ppc-macos ~x86-macos"
IUSE="doc gnutls idn libressl libsecret +mta nls sasl ssl vim-syntax"
-CDEPEND="
+DEPEND="
idn? ( net-dns/libidn:= )
libsecret? ( app-crypt/libsecret )
nls? ( virtual/libintl )
)
"
-RDEPEND="${CDEPEND}
+RDEPEND="${DEPEND}
net-mail/mailbase
mta? (
!mail-mta/courier
)
"
-DEPEND="${CDEPEND}
+BDEPEND="${DEPEND}
doc? ( virtual/texi2dvi )
nls? ( sys-devel/gettext )
virtual/pkgconfig