-# optional linux/perf_event.h
-AC_CHECK_HEADERS([linux/perf_event.h], [have_perf_event=yes], [])
-
-# Perf event counters are supported on all architectures supported by
-# perf, using the read system call as fallback.
-AM_CONDITIONAL([HAVE_PERF_EVENT], [test "x$have_perf_event" = "xyes"])
-
-AH_TEMPLATE([HAVE_PERF_EVENT], ["Perf event integration via perf_event.h"])
-AS_IF([test "x$have_perf_event" = "xyes"], [
- AC_DEFINE([HAVE_PERF_EVENT], [1])
-])