build grpc-c module
diff --git a/Makefile.am b/Makefile.am
index 8bff50f..c2727ad 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,2 +1,9 @@
 SUBDIRS = src
 dist_doc_DATA = README.md INSTALL.md
+
+all: grpc-c
+
+grpc-c:
+	cd third_party/grpc-c; autoreconf --install; git submodule update --init; ./configure
+	make -C third_party/grpc-c
+