/tmp/ccMSYAB2.o: In function `do_test':
/cygdrive/c/CAB202/temp/3af31daf-5feb-471b-a6d5-5eb829152750/test_60093.c:237: undefined reference to `Contrast'
/cygdrive/c/CAB202/temp/3af31daf-5feb-471b-a6d5-5eb829152750/test_60093.c:241: undefined reference to `Contrast'
collect2: error: ld returned 1 exit status
make: *** [makefile:15: cycle_contrast] Error 1