>>> Emerging (5 of 253) dev-libs/apr-util-0.9.12 to /

* download, patch, and source unpack here*

>>> Source unpacked.

*successful configure run here, then..*

configure: error: Berkeley DB not found.

!!! Please attach the following file when filing a report to bugs.gentoo.org:
!!! /var/tmp/portage/dev-libs/apr-util-0.9.12/work/apr-util-0.9.12/config.log

!!! ERROR: dev-libs/apr-util-0.9.12 failed.
Call stack:
  ebuild.sh, line 1614:   Called dyn_compile
  ebuild.sh, line 971:   Called qa_call 'src_compile'
  environment, line 3852:   Called src_compile
  apr-util-0.9.12.ebuild, line 50:   Called econf '--datadir=/usr/share/apr-util-0' '--with-apr=/usr' '--with-expat=/usr' '--with-gdbm' '--with-dbm=db45' '--with-berkeley-db=/usr/include/db4.5:/usr/lib'
  ebuild.sh, line 577:   Called die

!!! econf failed
!!! If you need support, post the topmost build error, and the call stack if relevant.
!!! A complete build log is located at '/var/tmp/portage/dev-libs/apr-util-0.9.12/temp/build.log'.