rename gts to alts
diff --git a/config.m4 b/config.m4
index 54e29cc..5c492bd 100644
--- a/config.m4
+++ b/config.m4
@@ -270,8 +270,8 @@
     src/core/lib/security/transport/tsi_error.cc \
     src/core/lib/security/util/json_util.cc \
     src/core/lib/surface/init_secure.cc \
+    src/core/tsi/alts_transport_security.cc \
     src/core/tsi/fake_transport_security.cc \
-    src/core/tsi/gts_transport_security.cc \
     src/core/tsi/ssl_transport_security.cc \
     src/core/tsi/transport_security_grpc.cc \
     src/core/tsi/transport_security.cc \