makefile problem with gcc bison/flex on ubuntu
 

I presently have a compiler to write with Flex and Bison.
I have a lex.l file, and a parse.y in which there are no conflicts.
I also have a symtable.h included.

I have a makefile as follows...
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project: parse.tab.o lex.yy.o
echo ---> compiling and linking project program
cc -DYYDEBUG=1 -o project parse.tab.o lex.yy.o -ly -ll -lm

lex.yy.o: lex.yy.c parse.tab.h # the dependencies of lex.yy.o the lexer object
echo ---> determining dependency for lex.yy.o

lex.yy.o parse.tab.o: symtable.h #just declares that symtable.h is a dependency to both
echo ---> determining symtable.h dependency for lex.yy.o parse.tab.o

parse.tab.c parse.tab.h: parse.y # THE PARSE C AND H FILES MADE... OK to here
echo ---> making parse.tab.c and parse.tab.h
bison -d parse.y

lex.yy.c : lex.l # THE LEX C FILE MADE
echo ---> making lexfile
flex lex.l

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When I run it, I get the following output. The line numbers don't actually correspond. Could you advise as to how the makefile should be written to not have any error?
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joe@BlueAcer:/usr/local/project/chk$ make
makefile:9: warning: overriding commands for target `lex.yy.o'
makefile:6: warning: ignoring old commands for target `lex.yy.o'
echo ---> determining symtable.h dependency for lex.yy.o parse.tab.o
echo ---> making lexfile
flex lex.l
echo ---> making parse.tab.c and parse.tab.h
bison -d parse.y
echo ---> determining symtable.h dependency for lex.yy.o parse.tab.o
echo ---> compiling and linking project program
cc -DYYDEBUG=1 -o project parse.tab.o lex.yy.o -ly -ll -lm
cc: parse.tab.o: No such file or directory
cc: lex.yy.o: No such file or directory
make: *** [project] Error 1
joe@BlueAcer:/usr/local/project/chk$
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