Something must be mis-configured on your system.
From your build.log, at the beginning of the configure phase we find : > locale: Cannot set LC_ALL to default locale: No such file or directory For me, « default locale » is the locale defined by the LANG environment variable. From your mpv-environment.txt file : > declare -x LANG="en_US.utf8 ja_JP.utf8" I think that should be : > declare -x LANG="en_US.utf8" You should check your configuration files in /etc/env.d.
