||

      ( >=x11-libs/qt-4.2:4
            ( x11-libs/qt-gui:4 x11-libs/qt-opengl:4 )
       )

dev-libs/libpcre
virtual/lapack
virtual/opengl

ncurses?
      ( >=sys-libs/ncurses-5.4 )

umfpack?
      ( sci-libs/umfpack )

arpack?
      ( sci-libs/arpack )

fftw?
      ( >=sci-libs/fftw-3:3.0 )

portaudio?
      ( media-libs/portaudio )

ffcall?
      ( dev-libs/ffcall )