问使用cygwin运行makefile时出错

EN

FFLAGS=
BFLAGS=-d -v -y 
CFLAGS=-g -Wall -Wextra -std=c++11 -Wno-write-strings -I /usr/local/boost_1_50_0

FLEX=flex
BISON=bison
CC=g++

SRCS=y.tab.c ast.cpp tokentable.cpp symboltable.cpp main.cpp lex.yy.c      semanticanalyzer.cpp astnodevisitor.cpp constants.cpp astnodetypechecker.cpp utility.cpp  astnodecodegenerator.cpp
OBJS=y.tab.o ast.o tokentable.o symboltable.o main.o lex.yy.o semanticanalyzer.o  astnodevisitor.o constants.o astnodetypechecker.o utility.o astnodecodegenerator.o

cooc : ${OBJS} 
    ${CC} ${CFLAGS} -o $@ ${OBJS}

%.o : %.cpp
    ${CC} ${CFLAGS} -c $<

y.tab.c : cool.y
    ${BISON} ${BFLAGS} cool.y

lex.yy.c : cool.flex
    ${FLEX} ${FFLAGS} cool.flex

.depend: ${SRCS} 
    rm -f ./.depend
    ${CC} ${CFLAGS} -MM $^>>./.depend

include .depend