Mali OpenCL SDK Linux Cross-Compiler

Hello to all,

I am using a Debian Linux host computer. I would like to cross-compiler some ARM Mali OpenCL sample code from the SDK. I have been searching all over the Internet and I have found several websites that state that I should run either one of these install commands:

sudo apt-get install gcc-arm-linux-gnueabihf

sudo apt-get install g++-arm-linux-gnueabihf

However, when I run these commands, I get an error message stating "Unable to locate package".

Additional information, I ran these commands before the install gcc and g++ commands:

sudo dpkg --add-architecture armhf
sudo apt-get update

I noticed an errors:

W: Failed to fetch ppa.launchpad.net/.../Sources  404  Not Found

W: Failed to fetch ppa.launchpad.net/.../Packages  404  Not Found

W: Failed to fetch ppa.launchpad.net/.../Packages  404  Not Found

Any advice or help?

Thanks,

David