as of commit d7cacaa9ed01e2c42b2fdb373a92018c8423e3ce retroarch no longer compiles on arch linux x64 and returns this error
/tmp/packerbuild-0/retroarch-git/retroarch-git/src/RetroArch/input/input_common.c:946: undefined reference to driver' /tmp/packerbuild-0/retroarch-git/retroarch-git/src/RetroArch/input/input_common.c:951: undefined reference todriver’