From: Julian Ospald <hasufell@gentoo.org>
Date: Wed Oct 24 15:41:33 UTC 2012
Subject: build system

don't overwrite system CFLAGS, only append "-g -Os" if DEBUG=1 is passed
as argument

always use $(CC) instead of "gcc"

--- Makefile
+++ Makefile
@@ -1,4 +1,11 @@
-CFLAGS := -g -Os
+CC ?= gcc
+
+# set to 1 to enable debug flags
+DEBUG = 0
+ifeq ($(DEBUG),1)
+CFLAGS += -g -Os
+endif
+
 prefix := /usr
 etcprefix :=
 # Define appropiately for your distribution
@@ -70,7 +77,7 @@
 	rm -f ${CLEAN} ${OBJ} 
 
 tsc:    tsc.c
-	gcc -o tsc ${CFLAGS} -DSTANDALONE tsc.c ${LDFLAGS}
+	$(CC) -o tsc ${CFLAGS} -DSTANDALONE tsc.c ${LDFLAGS}
 
 dbquery: db.o dbquery.o memutil.o
 
@@ -101,7 +108,7 @@
 	echo $(SRC)
 
 config-test: config.c
-	gcc -DTEST=1 config.c -o config-test
+	$(CC) -DTEST=1 config.c -o config-test
 
 test:
 	$(MAKE) -C tests test DEBUG=""