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/usr/bin/gr_plot_fft is in gnuradio 3.7.5-5.

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#! /usr/bin/python
#!/usr/bin/env python
#
# Copyright 2012 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING.  If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#

from gnuradio.plot_fft_base import plot_fft_base

# This is a wrapper program for plot_fft_base. It handles any data
# type and defaults to complex64.

def main():
    parser = plot_fft_base.setup_options()
    (options, args) = parser.parse_args ()
    if len(args) != 1:
        parser.print_help()
        raise SystemExit, 1
    filename = args[0]

    dc = plot_fft_base(options.data_type, filename, options)

if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        pass