+all: $(TARGETS)
+
+btree: main.o $(BTREE_COMMON)
+ g++ -o btree main.o $(BTREE_COMMON)
+
+btree_variable: main_variable.o $(BTREE_COMMON)
+ g++ -o btree_variable main_variable.o $(BTREE_COMMON)
+
+libbtree.a: $(BTREE_COMMON)
+ $(AR) cru libbtree.a $(BTREE_COMMON)