fix(Makefile): -lgcov, TOOLS = basen

Makefile

@@ -15,7 +15,7 @@ OBJS =\
 	base64\
 	hash/sha256\
 
-TOOLS =\
+TOOLS = ${LIB}
 
 TESTS =\
 	test-hex\
@@ -91,7 +91,7 @@ ${OBJDIR}/%${-g}-cov.o: ${SRCDIR}/%.cpp ${INCDIR}/${LIB}/%.hpp
 	${CC} -o $@ -c $< -I${INCDIR} ${-l} ${CFLAGS} --coverage
 
 ${BINDIR}/%${-g}-cov: ${TESTDIR}/%.cpp ${patsubst %, ${OBJDIR}/%${-g}-cov.o, ${OBJS}}
-	${CC} -o $@ $^ -I${INCDIR} ${-l} -lgtest ${CFLAGS} --coverage
+	${CC} -o $@ $^ -I${INCDIR} ${-l} -lgtest -lgcov ${CFLAGS}
 
 clean:
 	rm -rf ${DIRS}