Calculating dependencies... done!
>>> Emerging (1 of 1) sci-mathematics/scilab-2.7-r3 to /
>>> checking ebuild checksums ;-)
>>> checking auxfile checksums ;-)
>>> checking miscfile checksums ;-)
>>> checking scilab-2.7.src.tar.gz ;-)
>>> checking patch_browsehelp.tar.gz ;-)
which: no scilab in (/usr/local/sbin:/sbin:/usr/sbin:/usr/lib/portage/bin:/usr/local/bin:/bin:/usr/bin:/opt/bin:/usr/i686-pc-linux-gnu/gcc-bin/4.1.1:/usr/i686-pc-linux-gnu/gcc-bin/4.1.1:/opt/intel/compiler70/ia32/bin:/usr/qt/3/bin)
>>> Unpacking source...
>>> Unpacking scilab-2.7.src.tar.gz to /var/tmp/portage/scilab-2.7-r3/work
>>> Unpacking patch_browsehelp.tar.gz to /var/tmp/portage/scilab-2.7-r3/work
>>> Unpacking /patch_browsehelp.tar.gz to /var/tmp/portage/scilab-2.7-r3/work/scilab-2.7
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/scilab-2.7-r3/work/scilab-2.7 ...
 * econf: updating scilab-2.7/config/config.guess with /usr/share/gnuconfig/config.guess
 * econf: updating scilab-2.7/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 --without-tk --with-gtk --build=i686-pc-linux-gnu
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
creating Path.incl
configuration of libtool
checking for i686-pc-linux-gnu-gcc... i686-pc-linux-gnu-gcc
checking for C compiler default output... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for executable suffix...
checking for object suffix... o
checking whether we are using the GNU C compiler... yes
checking whether i686-pc-linux-gnu-gcc accepts -g... yes
checking for ld used by 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/i686-pc-linux-gnu-nm -B
checking whether ln -s works... yes
checking how to recognise dependant libraries... pass_all
checking command to parse /usr/bin/i686-pc-linux-gnu-nm -B output... ok
checking how to run the C preprocessor... i686-pc-linux-gnu-gcc -E
checking for dlfcn.h... yes
checking for i686-pc-linux-gnu-ranlib... i686-pc-linux-gnu-ranlib
checking for i686-pc-linux-gnu-strip... strip
checking for objdir... .libs
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 if i686-pc-linux-gnu-gcc supports -c -o file.lo... yes
checking if i686-pc-linux-gnu-gcc supports -fno-rtti -fno-exceptions... yes
checking whether the linker (/usr/i686-pc-linux-gnu/bin/ld) supports shared libraries... yes
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking dynamic linker characteristics... GNU/Linux ld.so
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
checking whether -lc should be explicitly linked in... no
creating libtool
end of configuration of libtool
checking for main in -lieee... yes
checking for g77... yes
checking for X... libraries /usr/X11R6/lib, headers
checking for dnet_ntoa in -ldnet... no
checking for dnet_ntoa in -ldnet_stub... no
checking for gethostbyname... no
checking for gethostbyname in -lnsl... no
checking for gethostbyname in -lbsd... no
checking for connect... no
checking for connect in -lsocket... no
checking for remove... no
checking for remove in -lposix... no
checking for shmat... no
checking for shmat in -lipc... no
checking for IceConnectionNumber in -lICE... no
checking for X11 release... R6
checking for main in -lXmu... no
checking for main in -lXaw3d... no
configure: error: Xaw3d missing. Use configure with option: --without-xaw3d

!!! Please attach the following file when filing a report to bugs.gentoo.org:
!!! /var/tmp/portage/scilab-2.7-r3/work/scilab-2.7/config.log

!!! ERROR: sci-mathematics/scilab-2.7-r3 failed.
Call stack:
  ebuild.sh, line 1539:   Called dyn_compile
  ebuild.sh, line 939:   Called src_compile
  scilab-2.7-r3.ebuild, line 61:   Called econf '--without-tk' '--with-gtk'
  ebuild.sh, line 541:   Called die

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