Don't build STS when it does not exist.
Change-Id: I7d5f6e11c7369fa473108605183581ad00e83887
diff --git a/core/tasks/sts.mk b/core/tasks/sts.mk
index b3c3baa..0c33e1c 100644
--- a/core/tasks/sts.mk
+++ b/core/tasks/sts.mk
@@ -12,6 +12,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+ifneq ($(wildcard test/sts/README.md),)
test_suite_name := sts
test_suite_tradefed := sts-tradefed
test_suite_readme := test/sts/README.md
@@ -21,3 +22,4 @@
.PHONY: sts
sts: $(compatibility_zip)
$(call dist-for-goals, sts, $(compatibility_zip))
+endif