Gentoo

Install into your router?? I asked if that's what you wanted, and you said no! These other distributions are to install on a normal computer.

You must mean the linux mini-distribution for the wrt54g. It is the first google hit for the search terms linux wrt54g.

But you're not going to be able to do what you want with a router. It's not a full-fledged computer, you won't be able to fit all the things you need to do C programming on it.

cus I din understand wad u meant.

I am suppose to find an OS, or firmware, to install into the router, and using cygwin, a platform, to code C....

cygwin is for windows. It's not for linux, and certainly not for routers. You could use it to install gcc on your windows computer and use that to make programs for the router, maybye, though it's not going to be easy to get it to make programs for the weird processor in your router.

cygwin is a windows platform showing linux environment.

it can be used to code programs, for the router to talk to other computer that logged on to its wireless network, isnt it?

I am told this way....

Right. Or, close enough. It can be, but this isn't an easy task even on a real linux system. gcc needs special configuration to cross-compile this way.

thats why I need serious help....

I am not even C trained...

sigh......

this distro can also be used on your router.

[edit] Sorry, that link was broken.