Change makefile to compile with O2 unless DEBUG variable is specified

packet-exchange/build/Makefile

@@ -18,7 +18,12 @@ CLIENT_SRCS += utilities.c
 SERVER_OBJS = $(SERVER_SRCS:%.c=%.o)
 CLIENT_OBJS = $(CLIENT_SRCS:%.c=%.o)
 
+ifeq ($(DEBUG),)
+CFLAGS = -O2 -Wall -Wextra
+else
 CFLAGS = -Og -g -Wall -Wextra
+endif
+
 CFLAGS += -MD -MP
 CFLAGS += -I $(SRCDIR)
 CFLAGS += -std=gnu99