slot conflict

!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:

dev-lang/tcl:0

  (dev-lang/tcl-8.5.17:0/8.5::gentoo, installed) pulled in by
    dev-lang/tcl:0/8.5= required by (dev-tcltk/tls-1.6-r3:0/0::gentoo, installed)
                ^^^^^^^                                                                                              
    (and 3 more with the same problem)

  (dev-lang/tcl-8.6.6:0/8.6::gentoo, ebuild scheduled for merge) pulled in by
    ~dev-lang/tcl-8.6.6:0=[abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_ppc_32(-)?,abi_ppc_64(-)?,abi_s390_32(-)?,abi_s390_64(-)?] required by (dev-lang/tk-8.6.6:0/8.6::gentoo, ebuild scheduled for merge)
    ^             ^^^^^^^^                                                                                                                                                                                                                                                                                                                    
    >=dev-lang/tcl-8.6:0= required by (dev-tcltk/itcl-4.0.3:0/0::gentoo, ebuild scheduled for merge)
    ^^             ^^^^^^                                                                                                                                                     

net-misc/freerdp:0

  (net-misc/freerdp-2.0.0_pre20160722:0/2::gentoo, ebuild scheduled for merge) pulled in by
    (no parents that aren't satisfied by other packages in this slot)

  (net-misc/freerdp-1.2.1_pre20150326-r1:0/1.2::gentoo, installed) pulled in by
    =net-misc/freerdp-1*:0=[client] required by (media-video/vlc-2.2.4-r1:0/5-8::gentoo, ebuild scheduled for merge)
    ^                 ^^^^^                                                                                                                                                                   

x11-base/xorg-server:0

  (x11-base/xorg-server-1.19.2:0/1.19.2::gentoo, ebuild scheduled for merge) pulled in by
    (no parents that aren't satisfied by other packages in this slot)

  (x11-base/xorg-server-1.18.4:0/1.18.4::gentoo, installed) pulled in by
    <x11-base/xorg-server-1.19:0/1.18.4=[-minimal] required by (x11-drivers/xf86-video-virtualbox-5.0.32:0/0::gentoo, installed)
    ^                     ^^^^^^^^^^^^^^                                                                                                                                                                  
    x11-base/xorg-server:0/1.18.4= required by (x11-drivers/xf86-video-s3virge-1.10.7:0/0::gentoo, installed)
                        ^^^^^^^^^^                                                                                                               
    (and 4 more with the same problems)