The current ebuild lists "=dev-libs/libsigc++-1.2*" in its RDEPEND.
When I tried to emerge it, it bailed out, stating that libsigc++ 2.0 was
missing.
After having emerged libsigc++-2.0.15 I could successfully emerge bfilter.
checking for SIGC_CFLAGS...
checking for SIGC_LIBS...
configure: error: Package requirements (sigc++-2.0) were not met.
Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.
Alternatively you may set the SIGC_CFLAGS and SIGC_LIBS environment variables
to avoid the need to call pkg-config. See the pkg-config man page for
more details.
!!! Please attach the config.log to your bug report:
!!! /var/tmp/portage/bfilter-0.10.1/work/bfilter-0.10.1/config.log
!!! ERROR: net-proxy/bfilter-0.10.1 failed.
!!! Function econf, Line 495, Exitcode 0
!!! econf failed
!!! If you need support, post the topmost build error, NOT this status message.