.PHONY: libshared
libshared: tree_s.o
	gcc -shared tree.o -o libtree.so

tree_s.o: tree.c tree_pub.h tree_priv.h
	gcc -fPIC -c tree.c

.PHONY: shared
shared: libshared main.o
	gcc -Wall -dynamiclib -o main main.o -L. -ltree -lm