can't make tpcc-start

OS: MAC OS 10.6.7
MYSQL 5.5.8
when make after generated tpcc-load but has not generated tpcc-start and report the follow error
[05:49:00]hongbin@MacBook-Pro:~/Tool/tpcc-mysql/src
-> $ make
cc -w -O2 -g -I. `mysql_config --include` -c main.c
main.c: In function ‘main’:
main.c:94: error: ‘timer_t’ undeclared (first use in this function)
main.c:94: error: (Each undeclared identifier is reported only once
main.c:94: error: for each function it appears in.)
main.c:94: error: expected ‘;’ before ‘timer’
make: *** [main.o] Error 1