>>> Unpacking source...
>>> Unpacking eix-0.5.6.tar.bz2 to /var/tmp/portage/eix-0.5.6/work
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/eix-0.5.6/work/eix-0.5.6 ...
 * econf: updating eix-0.5.6/config/config.guess with /usr/share/gnuconfig/config.guess
 * econf: updating eix-0.5.6/config/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 --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 a BSD-compatible install... /bin/install -c
checking whether build environment is sane... yes
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether ln -s works... yes
checking for i686-pc-linux-gnu-g++... i686-pc-linux-gnu-g++
checking for C++ compiler default output file name... a.out
checking whether the C++ compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... 
checking for suffix of object files... o
checking whether we are using the GNU C++ compiler... yes
checking whether i686-pc-linux-gnu-g++ accepts -g... yes
checking for style of include used by make... GNU
checking dependency style of i686-pc-linux-gnu-g++... gcc3
checking for i686-pc-linux-gnu-gcc... i686-pc-linux-gnu-gcc
checking whether we are using the GNU C compiler... yes
checking whether i686-pc-linux-gnu-gcc accepts -g... yes
checking for i686-pc-linux-gnu-gcc option to accept ISO C89... none needed
checking dependency style of i686-pc-linux-gnu-gcc... gcc3
checking for a sed that does not truncate output... /bin/sed
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for ld used by i686-pc-linux-gnu-gcc... /usr/i686-pc-linux-gnu/bin/ld
checking if the linker (/usr/i686-pc-linux-gnu/bin/ld) is GNU ld... yes
checking for /usr/i686-pc-linux-gnu/bin/ld option to reload object files... -r
checking for BSD-compatible nm... /usr/bin/nm -B
checking how to recognise dependent libraries... pass_all
checking how to run the C preprocessor... i686-pc-linux-gnu-gcc -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking dlfcn.h usability... yes
checking dlfcn.h presence... yes
checking for dlfcn.h... yes
checking how to run the C++ preprocessor... i686-pc-linux-gnu-g++ -E
checking for i686-pc-linux-gnu-g77... i686-pc-linux-gnu-g77
checking whether we are using the GNU Fortran 77 compiler... yes
checking whether i686-pc-linux-gnu-g77 accepts -g... yes
checking the maximum length of command line arguments... 32768
checking command to parse /usr/bin/nm -B output from i686-pc-linux-gnu-gcc object... ok
checking for objdir... .libs
checking for i686-pc-linux-gnu-ar... i686-pc-linux-gnu-ar
checking for i686-pc-linux-gnu-ranlib... i686-pc-linux-gnu-ranlib
checking for i686-pc-linux-gnu-strip... i686-pc-linux-gnu-strip
checking for correct ltmain.sh version... yes
checking if i686-pc-linux-gnu-gcc supports -fno-rtti -fno-exceptions... no
checking for i686-pc-linux-gnu-gcc option to produce PIC... -fPIC
checking if i686-pc-linux-gnu-gcc PIC flag -fPIC works... yes
checking if i686-pc-linux-gnu-gcc static flag -static works... yes
checking if i686-pc-linux-gnu-gcc supports -c -o file.o... yes
checking whether the i686-pc-linux-gnu-gcc linker (/usr/i686-pc-linux-gnu/bin/ld) supports shared libraries... yes
checking whether -lc should be explicitly linked in... no
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
configure: creating libtool
appending configuration tag "CXX" to libtool
checking for ld used by i686-pc-linux-gnu-g++... /usr/i686-pc-linux-gnu/bin/ld
checking if the linker (/usr/i686-pc-linux-gnu/bin/ld) is GNU ld... yes
checking whether the i686-pc-linux-gnu-g++ linker (/usr/i686-pc-linux-gnu/bin/ld) supports shared libraries... yes
checking for i686-pc-linux-gnu-g++ option to produce PIC... -fPIC
checking if i686-pc-linux-gnu-g++ PIC flag -fPIC works... yes
checking if i686-pc-linux-gnu-g++ static flag -static works... yes
checking if i686-pc-linux-gnu-g++ supports -c -o file.o... yes
checking whether the i686-pc-linux-gnu-g++ linker (/usr/i686-pc-linux-gnu/bin/ld) supports shared libraries... yes
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
appending configuration tag "F77" to libtool
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
checking for i686-pc-linux-gnu-g77 option to produce PIC... -fPIC
checking if i686-pc-linux-gnu-g77 PIC flag -fPIC works... yes
checking if i686-pc-linux-gnu-g77 static flag -static works... yes
checking if i686-pc-linux-gnu-g77 supports -c -o file.o... yes
checking whether the i686-pc-linux-gnu-g77 linker (/usr/i686-pc-linux-gnu/bin/ld) supports shared libraries... yes
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking for regcomp... yes
checking for strchr... yes
checking for strcspn... yes
checking for strdup... yes
checking for strerror... yes
checking for strstr... no
configure: error: We really need those functions ..

!!! Please attach the following file when filing a report to bugs.gentoo.org:
!!! /var/tmp/portage/eix-0.5.6/work/eix-0.5.6/config.log

!!! ERROR: app-portage/eix-0.5.6 failed.
Call stack:
  ebuild.sh, line 1545:   Called dyn_compile
  ebuild.sh, line 940:   Called src_compile
  ebuild.sh, line 606:   Called econf
  ebuild.sh, line 541:   Called die

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