this derivation will be built:
  /nix/store/6f7ccjdx9hnlj3gp0l924ygrn3nvq68d-mpv-youtube-quality-unstable-2020-02-11.drv
building '/nix/store/6f7ccjdx9hnlj3gp0l924ygrn3nvq68d-mpv-youtube-quality-unstable-2020-02-11.drv'
mpv-youtube-quality-unstable-2020-02-11> unpacking sources
mpv-youtube-quality-unstable-2020-02-11> unpacking source archive /nix/store/03vsrk2rakbwxkmmy017dayrp6w9ssaz-source
mpv-youtube-quality-unstable-2020-02-11> source root is source
mpv-youtube-quality-unstable-2020-02-11> patching sources
mpv-youtube-quality-unstable-2020-02-11> configuring
mpv-youtube-quality-unstable-2020-02-11> no configure script, doing nothing
mpv-youtube-quality-unstable-2020-02-11> installing
mpv-youtube-quality-unstable-2020-02-11> post-installation fixup
mpv-youtube-quality-unstable-2020-02-11> shrinking RPATHs of ELF executables and libraries in /nix/store/shzicfs01zkmxx57ka1s1j01pv00ag9g-mpv-youtube-quality-unstable-2020-02-11
mpv-youtube-quality-unstable-2020-02-11> patching script interpreter paths in /nix/store/shzicfs01zkmxx57ka1s1j01pv00ag9g-mpv-youtube-quality-unstable-2020-02-11
mpv-youtube-quality-unstable-2020-02-11> checking for references to /build/ in /nix/store/shzicfs01zkmxx57ka1s1j01pv00ag9g-mpv-youtube-quality-unstable-2020-02-11...

upload niks3: ok