Merge pull request #2 from silvio/sfr/update-make-files

makefiles a bit more compliant

Makefile

@@ -1,8 +1,9 @@
-CC=gcc
-CFLAGS=-fPIC
-CFLAGS_SHARED=-shared
+CC?=gcc
+CFLAGS?=-fPIC
+CFLAGS_SHARED?=-shared
 OBJ=mma8451.o
 LIBNAME=libmma8451.so
+HEADER=mma8451.h
 TESTOBJ=mma8451-test.o
 TESTNAME=mma8451-test
 
@@ -11,8 +12,10 @@ all: compile
 compile: $(LIBNAME) $(TESTNAME)
 
 install: $(LIBNAME)
-	cp $(LIBNAME) /usr/lib/$(LIBNAME)
-	cp $(TESTNAME) /usr/bin/$(TESTNAME)
+	install -d 0755 ${DESTDIR}/usr/lib $(DESTDIR)/usr/bin $(DESTDIR)/usr/include/mma8451
+	install -m 0644 $(LIBNAME) $(DESTDIR)/usr/lib/$(LIBNAME)
+	install -m 0644 $(TESTNAME) $(DESTDIR)/usr/bin/$(TESTNAME)
+	install -m 0644 $(HEADER) $(DESTDIR)/usr/include/mma8451/$(HEADER)
 
 fix-i2c:
 	echo -n 1 > /sys/module/i2c_bcm2708/parameters/combined
@@ -24,7 +27,7 @@ clean:
 	$(CC) -c -o $@ $< $(CFLAGS)
 
 $(LIBNAME): $(OBJ)
-	gcc -o $@ $^ $(CFLAGS) $(CFLAGS_SHARED)
+	$(CC) -o $@ $^ $(CFLAGS) $(CFLAGS_SHARED)
 
 $(TESTNAME): $(LIBNAME) $(TESTOBJ)
-	gcc -o $@ $^ $(CFLAGS) -L. -lmma8451
+	$(CC) -o $@ $^ $(CFLAGS) -L. -lmma8451