nullhost win # emerge octave Calculating dependencies... done!

>>> Emerging (1 of 1) sci-mathematics/octave-2.1.69 to /
 * octave-2.1.69.tar.bz2 size ;-) ...                                                                                                                                      [ ok ] * octave-2.1.69.tar.bz2 RMD160 ;-) ...                                                                                                                                    [ ok ] * octave-2.1.69.tar.bz2 SHA256 ;-) ...                                                                                                                                    [ ok ] * octave-2.1.69.tar.bz2 MD5 ;-) ...                                                                                                                                       [ ok ] * checking ebuild checksums ;-) ...                                                                                                                                       [ ok ] * checking auxfile checksums ;-) ...                                                                                                                                      [ ok ] * checking miscfile checksums ;-) ...                                                                                                                                     [ ok ] * checking octave-2.1.69.tar.bz2 ;-) ...                                                                                                                                  [ ok ]which: no g77 in (/usr/local/sbin:/sbin:/usr/sbin:/usr/lib/portage/bin:/usr/local/bin:/bin:/usr/bin:/opt/bin:/usr/x86_64-pc-linux-gnu/gcc-bin/4.1.1:/usr/kde/3.5/sbin:/usr/kde/3.5/bin:/usr/qt/3/bin)
 * No fortran compiler found on the system!
 * Please add fortran to your USE flags and reemerge gcc!

!!! ERROR: sci-mathematics/octave-2.1.69 failed.
Call stack:
  ebuild.sh, line 1562:   Called dyn_setup
  ebuild.sh, line 665:   Called pkg_setup
  octave-2.1.69.ebuild, line 40:   Called die

!!! (no error message)
!!! If you need support, post the topmost build error, and the call stack if relevant.