MarsSeed [1] filed a deletion request for arm-none-eabi-gcc53-linaro [2]: Linaro deleted the source. They have discontinued distributing their own forks in favor of the official upstream GNU toolchain, supported by contributions from ARM and its partners. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/arm-none-eabi-gcc53-linaro/