Let me clarify that I have a working installation of silo, but the above
 problem came up as I am trying to do a "emerge -e world".
I had run a "emerge --depclean" and various stuff was removed, maybe
something necessary for the emerge of silo.
Here is the relevan section from /var/log/emerge.log

1189871561:  *** emerge --ask --verbose depclean
1189871572:  >>> depclean
1189871654: === Unmerging... (sys-devel/automake-1.8.5-r3)
1189871686:  >>> unmerge success: sys-devel/automake-1.8.5-r3
1189871686: === Unmerging... (sys-devel/automake-1.5)
1189871717:  >>> unmerge success: sys-devel/automake-1.5
1189871717: === Unmerging... (sys-devel/automake-1.6.3)
1189871747:  >>> unmerge success: sys-devel/automake-1.6.3
1189871747: === Unmerging... (sys-devel/automake-1.4_p6)
1189871777:  >>> unmerge success: sys-devel/automake-1.4_p6
1189871777: === Unmerging... (sys-devel/automake-1.9.6-r2)
1189871808:  >>> unmerge success: sys-devel/automake-1.9.6-r2
1189871808: === Unmerging... (sys-devel/automake-1.7.9-r1)
1189871839:  >>> unmerge success: sys-devel/automake-1.7.9-r1
1189871839: === Unmerging... (dev-util/unifdef-1.20)
1189871859:  >>> unmerge success: dev-util/unifdef-1.20
1189871859: === Unmerging... (sys-libs/pwdb-0.62)
1189871903:  >>> unmerge success: sys-libs/pwdb-0.62
1189871903: === Unmerging... (sys-devel/autoconf-2.13)
1189871932:  >>> unmerge success: sys-devel/autoconf-2.13
1189871932: === Unmerging... (sys-libs/db-4.2.52_p2-r1)
1189871969:  >>> unmerge success: sys-libs/db-4.2.52_p2-r1
1189871969:  *** exiting successfully.
1189872074:  *** terminating.

I by-passed with "emerge --resume --skipfirst" and so far so good.
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