+ $(AM_V_PROTOC_C)protoc-c -I$(srcdir) --c_out . $(srcdir)/pinba.proto
+endif
+
+# Protocol buffer for the "write_riemann" plugin.
+EXTRA_DIST += riemann.proto
+if BUILD_PLUGIN_WRITE_RIEMANN
+CLEANFILES += riemann.pb-c.c riemann.pb-c.h
+
+BUILT_SOURCES += riemann.pb-c.c riemann.pb-c.h
+
+riemann.pb-c.c riemann.pb-c.h: riemann.proto
+ $(AM_V_PROTOC_C)protoc-c -I$(srcdir) --c_out . $(srcdir)/riemann.proto
+endif