perf build failure

perf build failed on 3.4.0+ linus tree.
Error meesage seems like this

LINK perf
libperf.a(pmu.o): In function `pmu_format_parse':
/home/linux/tools/perf/util/pmu.c:47: undefined reference to `perf_pmu_in'
libperf.a(pmu-bison.o): In function `perf_pmu_parse':
/home/linux/tools/perf/util/pmu-bison.c:1287: undefined reference to `perf_pmu_lex'
collect2: ld returned 1 exit status
make: *** [perf] Error 1

Were flex and bison installed prior to this build attempt or did you install after a failure and then pickup the build again? If so, try 'make clean' followed by make again.

David