Compile Kernel Modules ReadynasOS RN102

I still running in to some errors when i'm trying to compile the desired modules...
I have a ReadyNas RN102, with firmware 6.1.8.

I want to compile the usb serial driver modules:
- PL2303
- Generic Serial

I made the following steps:

- Download and extract, http://www.downloads.netgear.com/files/GPL/ReadyNASOS_V6.1.8_WW_src.zip
- I copied this file /linux-3.0.101-0.15/arch/arm/configs/armada370_nas_defconfig to /linux-3.0.101-0.15/.config
- Make menuconfig
- make arch=arm

Then I receive the following error:

make: arm-mv7-linux-gnueabi-gcc: Command not found

This must have something to do with cross-compiling. But as far as I know, I don't want to crosscompile, because i'm compiling on the same machine.

I tried to edit te .config file. Commented the line: #CONFIG_CROSS_COMPILE="arm-mv7-linux-gnueabi-"
Then its starts compile, but in the end I see a lot of errors and can't find my modules...

Any help would be appreciated!
If any other information is required, let me know.