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+dnl Copyright 2001,2002,2003,2004,2005,2006 Free Software Foundation, Inc.
+dnl
+dnl This file is part of GNU Radio
+dnl
+dnl GNU Radio is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 3, or (at your option)
+dnl any later version.
+dnl
+dnl GNU Radio is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+dnl GNU General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with GNU Radio; see the file COPYING. If not, write to
+dnl the Free Software Foundation, Inc., 51 Franklin Street,
+dnl Boston, MA 02110-1301, USA.
+
+AC_DEFUN([GR_FORTRAN],[
+ dnl if you want to generate a different table of interpolator taps, you need fortran.
+ dnl we default to off, since almost no one wants to do this.
+ AC_ARG_ENABLE(fortran, AC_HELP_STRING([--enable-fortran],[enable fortran (no)]),
+ [], [enable_fortran=no])
+ AM_CONDITIONAL(ENABLE_FORTRAN, test "x$enable_fortran" = xyes)
+
+ if test "x$enable_fortran" = xyes
+ then
+ AC_PROG_F77
+ AC_F77_LIBRARY_LDFLAGS
+ fi
+])
personal git repositories of Harald Welte. Your mileage may vary