make flags: building meta-build sed "s@__prefix__@/nix/store/zzj7c6dhxaia9ymj7xw32xc5mj2s2562-meta-build-env@g;\ s@__datadir__@/nix/store/zzj7c6dhxaia9ymj7xw32xc5mj2s2562-meta-build-env/share@g;\ s@__PACKAGE__@meta-build-env@g" < meta-build.src > meta-build && chmod +x meta-build