fix-up rules for sphere demo, which uses readtex utility

progs/samples/Makefile

@@ -18,8 +18,7 @@ PROGS = accum bitmap1 bitmap2 blendeq blendxor copy cursor depth eval fog \
 .SUFFIXES: .c
 
 .c: $(LIB_DEP)
-	$(CC) -I$(INCDIR) $(CFLAGS) $< $(APP_LIB_DEPS) -o $@
-
+	$(CC) -I$(INCDIR) $(CFLAGS) $< readtex.o $(APP_LIB_DEPS) -o $@
 
 
 ##### TARGETS #####
@@ -27,6 +26,22 @@ PROGS = accum bitmap1 bitmap2 blendeq blendxor copy cursor depth eval fog \
 default: $(PROGS)
 
 
+sphere: sphere.o readtex.o
+	$(CC) -I$(INCDIR) $(CFLAGS) sphere.o readtex.o $(APP_LIB_DEPS) -o $@
+
+sphere.o: sphere.c readtex.h
+	$(CC) -c -I$(INCDIR) $(CFLAGS) sphere.c
+
+readtex.c: ../util/readtex.c
+	cp ../util/readtex.c .
+
+readtex.h: ../util/readtex.h
+	cp ../util/readtex.h .
+
+readtex.o: readtex.c readtex.h
+	$(CC) -c -I$(INCDIR) $(CFLAGS) $< -o $@
+
+
 clean:
 	-rm -f $(PROGS)
 	-rm -f *.o *~