A compiling problem with a simplest comedi pogram

Hi,

I am doing with the comedi+RTAI on a NI PCI-6259 DAQ Card.

I've got the comedi cmd program and test program running correctly.

When I try to write my own program, starting with the one in the tutorial


#include <stdio.h>   /* for printf() */
#include <comedilib.h <http://www.comedi.org/doc/x4003.html#COMEDI-COMEDILIB-H>>

int subdev = 0;         /* change this to your input subdevice */
int chan = 0;           /* change this to your channel */
int range = 0;          /* more on this later */
int aref = AREF_GROUND
<http://www.comedi.org/doc/x4003.html#AREF-GROUND>; /* more on this
later */

int main(int argc,char *argv[])
{
  comedi_t <http://www.comedi.org/doc/x4003.html#REF-TYPE-COMEDI-T> *it;
  lsampl_t <http://www.comedi.org/doc/x4003.html#REF-TYPE-LSAMPL-T> data;

  it=comedi_open <http://www.comedi.org/doc/r4226.html>("/dev/comedi0");

  comedi_data_read
<http://www.comedi.org/doc/r5021.html>(it,subdev,chan,range,aref, &
data);

  printf("%d\n",data);

  return 0;
}

When I
cc tut1.c -lcomedi -o tut1

I got the following error

/usr/local/lib/libcomedi.so: undefined reference to `lrint'
collect2: ld returned 1 exit status

I think this error should be about some settings of the lib directory.
But I'm not quite sure. Can anyone help me have a look at on this?

Thanks.

Kelvin