OCTAVE_VERSION=$($MKOCTFILE -v 2>&1 | sed 's/mkoctfile, version //')
AX_COMPARE_VERSION([$OCTAVE_VERSION], [lt], [4.4], [AC_MSG_ERROR([Your Octave is too old, please upgrade to version 4.4 at least (or disable Octave support with --disable-octave).])])
AC_PROG_F77([gfortran g77 f77])
AC_PROG_FC
AC_PROG_CC
AC_PROG_CC_C99 # mjdgges DLL now uses C99 features (variable declared in for loop)