# emerge neon
Calculating dependencies ...done!
>>> emerge (1 of 1) net-misc/neon-0.25.3 to /
>>> checksums files   ;-) neon-0.25.3.ebuild
>>> checksums files   ;-) neon-0.24.7.ebuild
>>> checksums files   ;-) files/digest-neon-0.24.7
>>> checksums files   ;-) files/digest-neon-0.25.3
>>> checksums src_uri ;-) neon-0.25.3.tar.gz
>>> Unpacking source...
>>> Unpacking neon-0.25.3.tar.gz to /var/tmp/portage/neon-0.25.3/work
QA Notice: USE Flag 'userland_Darwin' not in IUSE for net-misc/neon-0.25.3
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/neon-0.25.3/work/neon-0.25.3 ...
 * econf: updating neon-0.25.3/config.guess with /usr/share/gnuconfig/config.guess
 * econf: updating neon-0.25.3/config.sub with /usr/share/gnuconfig/config.sub
./configure --prefix=/usr --host=i686-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --enable-shared --without-gssapi --with-zlib --with-ssl --with-xml2 --build=i686-pc-linux-gnu
configure: error: invalid feature name:

!!! ERROR: net-misc/neon-0.25.3 failed.
Call stack:
  ebuild.sh, line 1894:   Called dyn_compile
  ebuild.sh, line 941:   Called src_compile
  neon-0.25.3.ebuild, line 46:   Called econf 'compile' '--enable-shared' '--without-gssapi' '--with-zlib' '--with-ssl'

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