[gentoo-user] Why is xulrunner-bin required for acroread in amd64 (xulrunner not OK)

[Allan Gottlieb]

I have xulrunner installed on my x86 and amd64 machines.  When I tried
to install acroread on the amd64, it wanted to pull in xulrunner-bin.

Sure enough the ebuild contains

RDEPEND="media-libs/fontconfig
        cups? ( net-print/cups )
        x86? ( >=x11-libs/gtk+-2.0
                        ldap? ( net-nds/openldap )
                        !minimal? ( || ( net-libs/xulrunner
                                                net-libs/xulrunner-bin
                                                www-client/mozilla-firefox
                                                www-client/seamonkey
                                                www-client/seamonkey-bin ) ) )
        amd64? ( >=app-emulation/emul-linux-x86-baselibs-2.4.2
                        >=app-emulation/emul-linux-x86-gtklibs-2.0
                        !minimal? ( || ( net-libs/xulrunner-bin
                                                www-client/seamonkey-bin ) ) )"



So for amd64 we need (assuming not a minimal install) some emulation.
OK.

But why are the -bin packages good and the compile-from-source not good?

thanks,
allan