File vnstat-optflags.patch of Package vnstat

--- src/Makefile
+++ src/Makefile
@@ -1,5 +1,5 @@
 CC = gcc
-CFLAGS = -O2
+CFLAGS = -O2 $(RPM_OPT_FLAGS)
 OBJS = proc.o db.o misc.o
 OBJS64 = proc64.o db.o misc.o
 
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