... will look into some unit and integration testing for all metrics code next in a separate CL.

Review URL: http://codereview.chromium.org/1863002
diff --git a/metrics/Makefile b/metrics/Makefile
index 54b9f53..784ff91 100644
--- a/metrics/Makefile
+++ b/metrics/Makefile
@@ -8,8 +8,7 @@
 CCONFIG = $(shell $(PKG_CONFIG) --cflags dbus-1 glib-2.0 dbus-glib-1)
 LDCONFIG = $(shell $(PKG_CONFIG) --libs dbus-1 glib-2.0 gthread-2.0 dbus-glib-1)
 
-CFLAGS = -Wall -Werror -I/usr/include -fPIC -O2 $(CCONFIG)
-CXXFLAGS = $(CFLAGS) -fno-exceptions
+CXXFLAGS += -Wall -Werror -fPIC -fno-exceptions $(CCONFIG)
 
 CLIENT = metrics_client
 DAEMON = metrics_daemon
@@ -51,9 +50,6 @@
 %.o: %.cc
 	$(CXX) $(CXXFLAGS) -c $< -o $@
 
-%.o: %.c
-	$(CC) $(CFLAGS) -c $< -o $@
-
 # dependencies in addition to those defined by the rules
 
 metrics_daemon.o: \