I can not configure binutils

[Ricky Chan]

Hi,

I can not configure binutils under Cygwin, I got the following error message
in the end of configure.out.

flex: not found
checking for flex... lex
checking for yywrap in -ll... no
checking lex output file root... lex: not found
configure: error: cannot find output from lex; giving up
Configure in /tmp/build/binutils/binutils failed, exiting.

I used the following command for configuration that is found on the Red Hat
eCos Web

/src/binutils/binutils-2.10.1/configure --target=arm-elf \
--prefix=/tools \
--exec-prefix=/tools/H-i686-pc-cygwin \
-v 2>&1 | tee configure.out 

Can anybody help me solve this problem
thanks

Ricky Chan