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I'm trying to use flex and bison to create a simple scripting language. Right now, I'm just trying to get a calculator working. I can't get it to compile, though. When I run this makefile: OBJECTS = hug.tab.o hug.yy.o PROGRAM = hug.exe CPP = g++ LEX = flex YACC = bison .PHONY: all clean all: $(OBJECTS) $(CPP) $^ -o $(PROGRAM) clean: $(RM) *.o *.output *.tab.* *.yy.* $(PROGRAM) %.tab.o: %.tab.cpp $(CPP) -c -o $@ $< %.tab.cpp: %.ypp $(YACC) -vd $< %.yy.o: %.yy.c $(CPP) -c -o $@ $< %.yy.c: %.l $(LEX) -o $@ $< %.o: %.cpp $(CPP) -c -o $@ $< on my .l and .ypp files, I get this error: undefined reference to `yylex()' And if I make the command for all like this: $(CPP) $^ -o $(PROGRAM) -lfl it says it couldn't find -lfl . And if I make it like this: $(CPP) $^ -o -lfl $(PROGRAM) it goes back to the undefined reference error. Sorry I'm kind of clueless about this. EDIT: I have flex installed. I tried changing it from -lfl to C:/GnuWin32/lib/libfl.a (I'm trying to use Windows because Linux has odd problems on my computers and I don't have a Mac yet), but it still has the same error.

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