First thing I noticed, when I run the "openwrt_build_8.09.2.sh" script, It runs successful but I did notice the following warning:

-e Copying files..
cp: cannot create regular file `package/haserl/patches/': Is a directory
mkdir: cannot create directory `target/linux/brcm-2.4/files/drivers/net': File exists

Then I try to build it (using Ubuntu 10.04 LTS, AMD64) but I keep getting one warning and an error. This is the warning:

fludizz@brand:/media/sda5/Download/WNR3500L/OpenWRT_WNR3500L_Release_21May10/8.09.2$ make V=99
bash: /media/sda5/Download/WNR3500L/OpenWRT_WNR3500L_Release_21May10/8.09.2/scripts/getver.sh: Permission denied
bash: /media/sda5/Download/WNR3500L/OpenWRT_WNR3500L_Release_21May10/8.09.2/scripts/getver.sh: Permission denied

And the error states I do not have g++ installed. In fact I do have these installed, I even installed the older (available) versions from the Ubuntu repositories as well, so now I have g++-4.1, g++-4.1-multilib, g++-4.3, g++-4.3-multilib, g++-4.4 and g++-4.4-multilib.

The g++ command links to g++-4.4.

Which version of g++ does the firmware need to be build?