These are the packages that would be merged, in order:

Calculating world dependencies  
aux_get(): (0) Error in dev-util/eclipse-sdk-3.2.1 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in dev-util/eclipse-sdk-3.2.1-r1 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in dev-util/eclipse-sdk-3.2.1 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in dev-util/eclipse-sdk-3.2.1-r1 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in sys-apps/portage-2.1.2_pre3-r7 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in dev-libs/openssl-0.9.8d ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in dev-libs/openssl-0.9.7l ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in sys-libs/db-4.3.29-r2 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in sys-libs/db-3.2.9-r11 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in sys-libs/db-4.2.52_p4-r2 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in sys-apps/portage-2.1.2_pre3-r7 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in x11-libs/libICE-1.0.2 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in x11-libs/libSM-1.0.2 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in x11-libs/libXext-1.0.2 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in x11-libs/libXt-1.0.3 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in x11-libs/xtrans-1.0.2 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in x11-libs/xtrans-1.0.2 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in media-libs/alsa-lib-1.0.13 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in sys-devel/m4-1.4.6 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in sys-apps/coreutils-6.4 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in media-sound/alsa-headers-1.0.13 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in perl-core/Test-Harness-2.62 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in sys-libs/db-4.3.29-r2 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in sys-libs/db-3.2.9-r11 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in sys-libs/db-4.2.52_p4-r2 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in dev-lang/mono-1.1.18 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in sys-devel/bc-1.06.95 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in sys-devel/bc-1.06-r6 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)


aux_get(): (0) Error in sys-devel/bc-1.06.95 ebuild. (3328)
               Check for syntax error or corruption in the ebuild. (--debug)

 
!!! All ebuilds that could satisfy "sys-devel/bc" have been masked.
!!! One of the following masked packages is required to complete your request:
Traceback (most recent call last):
  File "/usr/bin/emerge", line 4469, in ?
    retval = emerge_main()
  File "/usr/bin/emerge", line 4464, in emerge_main
    myopts, myaction, myfiles, spinner)
  File "/usr/bin/emerge", line 3837, in action_build
    if not mydepgraph.xcreate(myaction):
  File "/usr/bin/emerge", line 1616, in xcreate
    if not self.select_dep(
  File "/usr/bin/emerge", line 1392, in select_dep
    myuse=selected_pkg[-1], rev_dep=rev_deps, arg=arg):
  File "/usr/bin/emerge", line 928, in create
    parent_arg=arg):
  File "/usr/bin/emerge", line 1385, in select_dep
    rev_dep=rev_deps, arg=arg):
  File "/usr/bin/emerge", line 928, in create
    parent_arg=arg):
  File "/usr/bin/emerge", line 1385, in select_dep
    rev_dep=rev_deps, arg=arg):
  File "/usr/bin/emerge", line 919, in create
    parent_arg=arg):
  File "/usr/bin/emerge", line 1345, in select_dep
    settings=pkgsettings, portdb=portdb)
  File "/usr/lib/portage/pym/portage.py", line 3849, in getmaskingstatus
    mygroups, eapi = portdb.aux_get(mycpv, ["KEYWORDS", "EAPI"])
  File "/usr/lib/portage/pym/portage.py", line 5000, in aux_get
    raise KeyError
KeyError