checking for i686-pc-linux-gnu-pkg-config... (cached) /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for GLIB... yes
checking db.h usability... yes
checking db.h presence... yes
checking for db.h... yes
checking Berkeley Database library version... 4.2
checking for db_env_create in -ldb-4.2... no
checking for db_env_create in -ldb4... no
configure: error: db.h reports Berkeley DB version is 4.2 but no db-4.2 library exists

!!! Please attach the following file when filing a report to bugs.gentoo.org:
!!! /var/tmp/portage/dctc-0.85.9/work/dctc-0.85.9/config.log

!!! ERROR: net-p2p/dctc-0.85.9 failed.
Call stack:
  ebuild.sh, line 1543:   Called dyn_compile
  ebuild.sh, line 938:   Called src_compile
  ebuild.sh, line 604:   Called econf
  ebuild.sh, line 539:   Called die

!!! econf failed
!!! If you need support, post the topmost build error, and the call stack if relevant.