Make returns error

[murugappan]

When I run make I get the following error. I'm on Ubuntu, Linux 4.4 and gcc version 5.4.1.

/tmp/ccryWoLq.o: In function `measureLoop':
/home/malagappan/Desktop/ftalat/main.c:66: undefined reference to `loop'
/tmp/ccryWoLq.o: In function `runTest':
/home/malagappan/Desktop/ftalat/main.c:102: undefined reference to `setFreq'
/home/malagappan/Desktop/ftalat/main.c:103: undefined reference to `waitCurFreq'
/tmp/ccryWoLq.o: In function `measureLoop':
/home/malagappan/Desktop/ftalat/main.c:66: undefined reference to `loop'
/tmp/ccryWoLq.o: In function `runTest':
/home/malagappan/Desktop/ftalat/main.c:112: undefined reference to `setFreq'
/home/malagappan/Desktop/ftalat/main.c:113: undefined reference to `waitCurFreq'
/tmp/ccryWoLq.o: In function `measureLoop':
/home/malagappan/Desktop/ftalat/main.c:66: undefined reference to `loop'
/tmp/ccryWoLq.o: In function `runTest':
/home/malagappan/Desktop/ftalat/main.c:161: undefined reference to `loop'
/home/malagappan/Desktop/ftalat/main.c:186: undefined reference to `setFreq'
/home/malagappan/Desktop/ftalat/main.c:190: undefined reference to `loop'
/home/malagappan/Desktop/ftalat/main.c:203: undefined reference to `loop'
/home/malagappan/Desktop/ftalat/main.c:218: undefined reference to `setFreq'
/home/malagappan/Desktop/ftalat/main.c:219: undefined reference to `waitCurFreq'
/tmp/ccbKngRT.o: In function `setFreqForAllRelatedCore':
/home/malagappan/Desktop/ftalat/CoreRelation.c:139: undefined reference to `setFreq'
collect2: error: ld returned 1 exit status
Makefile:8: recipe for target 'all' failed
make: *** [all] Error 1