LinuxQuestions.org - can't compile using apm.h

Hi all, i'm attempting to make a program to monitor and log my battery power (don't ask). I looked first at shell scripts, but I can't find any working shell commands that will report power (apm just says kernel doesn't support APM, acpid says it's busy, etc).

Therefore i've gone to a c program, because i know those have access to apm somehow (I have the battstat applet running, and it reports power just fine). problem there is, I can't compile anything that uses apm.h, the linker doesn't seem to find apm_read(). I've even gone thru apm.h itself and it does list that particular function.

Here's an excerpt of my test program:

Code:

#include <stdio.h>

#include <apm.h>

int main()

{

  apm_info apminfo;

  apm_read(&apminfo);

  int batt_life = apminfo.battery_percentage;

  printf("Battery life: %d%%", batt_life);

  return 0;

}

As you can see, very simple. I got inspiration for this from the source of battstat. As far as I can tell, apm_read() is supposed to fill the apm_info struct, so without that function, this approach is pretty useless.

Any ideas why this won't compile? or can you suggest any other routes to write a battery power logger?