[PerlChina] Using CPAN problem on cygwin

Hi, all

I met a problem when using CPAN on cygwin environment today.

---------------------------------------
operations-------------------------------------------------------
$ perl -MCPAN -e shell
CPAN: File::HomeDir loaded ok (v0.80)

cpan shell -- CPAN exploration and modules installation (v1.9205)
ReadLine support enabled
......
cpan[2]> install CPAN
......
Result: PASS
ANDK/CPAN-1.9301.tar.gz
/usr/bin/make test -- OK
Running make install
Prepending /cygdrive/c/Users/chenran/.cpan/build/CPAN-1.9301-SyhUB5/
blib/arch /cygdrive/c/Users/chen
ran/.cpan/build/CPAN-1.9301-SyhUB5/blib/lib to PERL5LIB for 'install'
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
ERROR: Can't create '/usr/bin'
Do not have write permissions on '/usr/bin'
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
at -e line 1
make: *** [pure_perl_install] Error 2
ANDK/CPAN-1.9301.tar.gz
/usr/bin/make install -- NOT OK
----
---------------------------------------
operations-------------------------------------------------------

it seems that just "make install" isn't successful, what shall I do
next?
also I have enter the build dir "~/.cpan/build/CPAN-1.9301-SyhUB5" and
manually "make install", the error is the same:

chenran@rchen23 ~/.cpan/build/CPAN-1.9301-SyhUB5
$ make install
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
ERROR: Can't create '/usr/bin'
Do not have write permissions on '/usr/bin'
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
at -e line 1
make: *** [pure_perl_install] Error 2
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