probe_i8k_calls_time.c undefined reference to `timestamp'

(i8kutils not available in repos. )

make fail on Fedora 24 :

gcc -Wall i8kctl.c -o i8kctl
gcc -Wall -c -g -DLIB i8kctl.c
gcc -Wall -c -g -DLIB probe_i8k_calls_time.c
gcc -o probe_i8k_calls_time i8kctl.o probe_i8k_calls_time.o
probe_i8k_calls_time.o: In function `main':
/root/i8kutils/probe_i8k_calls_time.c:37: undefined reference to `timestamp'
/root/i8kutils/probe_i8k_calls_time.c:39: undefined reference to `timestamp'
/root/i8kutils/probe_i8k_calls_time.c:41: undefined reference to `timestamp'
/root/i8kutils/probe_i8k_calls_time.c:43: undefined reference to `timestamp'
/root/i8kutils/probe_i8k_calls_time.c:45: undefined reference to `timestamp'
probe_i8k_calls_time.o:/root/i8kutils/probe_i8k_calls_time.c:47: more undefined references to `timestamp' follow
collect2: error: ld returned 1 exit status
Makefile:24: recipe for target 'probe_i8k_calls_time' failed
make: *** [probe_i8k_calls_time] Error 1