bluez utils complie error

hi, all
 I encountered an error when I compiled the bluez utils. If I compiled the
original code without modifying any code, there would be no error. But If I
modified the code, e.g., I added "printf("test\n");" in the function
dev_info in hcitool.c, there would be an error:

 make[2]: Entering directory
`/home/tester/bluez_code3.20/bluez-utils-3.20/hcid'
 test -f parser.c || /bin/bash ../ylwrap parser.y y.tab.c parser.c y.tab.h
parser.h y.output parser.output -- yacc -d
 ../ylwrap: line 111: yacc: command not found
 make[2]: *** [parser.c] Error 1
 make[2]: Leaving directory
`/home/tester/bluez_code3.20/bluez-utils-3.20/hcid'
 make[1]: *** [all-recursive] Error 1
 make[1]: Leaving directory `/home/tester/bluez_code3.20/bluez-utils-3.20'
 make: *** [all] Error 2
 
Could anyone help to resolve it?
Many thanks in advance.
Best regards
Shi Buyun

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