error accessing struct tm data from avr.libc time

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Hit Quote on this post (lower right corner) to see what the code tags in the read me before posting here look like.

#include <time.h>                                        

void setup() {

  Serial.begin(115200);
  Serial.println(" ");
  set_system_time(3681359818 - NTP_OFFSET);  // >>> sample from NTP request just for testing
  set_zone(1 * ONE_HOUR);                           
  set_position (47.737591, 9.16148185);         
  
  Serial.print("sun rise: ");
  time_t sunRise = sun_rise(1);
  Serial.println(sunRise);                                    // result is: 1397800573

 
  Serial.print("year: ");
  
  Serial.println(tm.tm_year);

If you want to use a tm struct then you have to declare one, same as any other variable.

int x;
tm myTime;

Then you have to fill it and then you can use it in some time.h functions or do this:

Serial.println( myTime.tm_year); // myTime is the variable and tm is the variable type (a struct)

It's a big do-everything standard C library that you can find more about through a net-search.
http://www.nongnu.org/avr-libc/user-manual/group__avr__time.html#ga26c7d1dbf93fa8c23c5effbacec91f8c