+# Check liblttng-ust-ctl library
+AC_ARG_ENABLE(lttng-ust,
+ [ --disable-lttng-ust build without LTTng-UST (Userspace Tracing) support.],
+ lttng_ust_support=no, lttng_ust_support=yes)
+
+[
+if test "x$lttng_ust_support" = "xno"; then
+ echo "LTTng-UST support disabled."
+else
+]
+ AC_CHECK_LIB([lttng-ust-ctl], [ustctl_create_session], [],
+ [AC_MSG_ERROR([Cannot find LTTng-UST. Use [LDFLAGS]=-Ldir to specify its location, or specify --disable-lttng-ust to build lttng-tools without LTTng-UST support.])]
+ )
+[
+ echo "LTTng-UST support enabled."
+fi
+]
+
+AM_CONDITIONAL([HAVE_LIBLTTNG_UST_CTL], [ test "x$ac_cv_lib_lttng_ust_ctl_ustctl_create_session" = "xyes" ])
+
+AC_CHECK_FUNCS([sched_getcpu sysconf])
+
+# Epoll check. If not present, the build will fallback on poll() API