StopWatch Sample2 Example Will Not Compile--exit status 1

here code:

code: [select]

#include <stopwatch.h>

stopwatch sw_millis;    // millis (default)
stopwatch sw_micros(stopwatch::micros);
stopwatch sw_secs(stopwatch::seconds);

void setup()
{
  serial.begin(9600);
  sw_millis.start();
  sw_micros.start();
  sw_secs.start();
}


void loop()
{
  serial.print("sw_millis=");
  serial.println(sw_millis.elapsed());
  serial.print("sw_micros=");
  serial.println(sw_micros.elapsed());
  serial.print("sw_secs=");
  serial.println(sw_secs.elapsed());

  delay(1000);
}

and here (verbose) error:

code: [select]

arduino: 1.6.12 (windows xp), board: "arduino/genuino uno"
,,,,,
linking together...
"c:\documents , settings\chris\local settings\application data\arduino15\packages\arduino\tools\avr-gcc\4.8.1-arduino5/bin/avr-gcc" -w -os -wl,--gc-sections -mmcu=atmega328p  -o "c:\docume~1\chris\locals~1\temp\arduino_build_90240/sketch_dec26a.ino.elf" "c:\docume~1\chris\locals~1\temp\arduino_build_90240\sketch\sketch_dec26a.ino.cpp.o" "c:\docume~1\chris\locals~1\temp\arduino_build_90240\libraries\stopwatch\stopwatch.cpp.o" "c:\docume~1\chris\locals~1\temp\arduino_build_90240/core\core.a" "-lc:\docume~1\chris\locals~1\temp\arduino_build_90240" -lm
collect2.exe: error: ld returned 5 exit status

using library stopwatch in folder: c:\documents , settings\chris\my documents\arduino\libraries\stopwatch (legacy)
exit status 1
error compiling board arduino/genuino uno.

note "sample" file comes stopwatch library compiles fine.

can see causing error?  know there lots of posts on "exit status 1" error, haven't found 1 applies in case. 

if there post definitive answer causes error , how fix it, i'd appreciative if post link.

thanks

quote

arduino: 1.6.12 (windows xp), board: "arduino/genuino uno"

have bothered search "windows xp" , see issues related still running beyond end of life operating system?

quote

can see causing error?

yes.

quote

but haven't found 1 applies in case. 

you not looking correct phrase.

quote

if there post definitive answer causes error , how fix it, i'd appreciative if post link.

you want google you? next, suppose you'll want upgrade stone age operating system, too.

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