>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/dev-libs/nspr-4.6.4-r2/work/nspr-4.6.4/mozilla/nsprpub ...
 * econf: updating nspr-4.6.4/mozilla/nsprpub/build/autoconf/config.guess with /usr/share/gnuconfig/config.guess
 * econf: updating nspr-4.6.4/mozilla/nsprpub/build/autoconf/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-ipv6 --build=i686-pc-linux-gnu
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
checking target system type... i686-pc-linux-gnu
checking for whoami... /usr/bin/whoami
../configure: line 3425: syntax error near unexpected token `}'
../configure: line 3425: `echo "${ECHO_T}yes" >&6; }'

!!! Please attach the following file when filing a report to bugs.gentoo.org:
!!! /var/tmp/portage/dev-libs/nspr-4.6.4-r2/work/nspr-4.6.4/mozilla/nsprpub/build/config.log

!!! ERROR: dev-libs/nspr-4.6.4-r2 failed.
Call stack:
  ebuild.sh, line 1613:   Called dyn_compile
  ebuild.sh, line 970:   Called qa_call 'src_compile'
  environment, line 3412:   Called src_compile
  nspr-4.6.4-r2.ebuild, line 47:   Called econf '--enable-ipv6'
  ebuild.sh, line 576:   Called die