make flags: building meta-build sed "s@__prefix__@/nix/store/hkfjs56z22rjj6sazpnlbc8b8a52gizd-meta-build-env@g;\ s@__datadir__@/nix/store/hkfjs56z22rjj6sazpnlbc8b8a52gizd-meta-build-env/share@g;\ s@__PACKAGE__@meta-build-env@g" < meta-build.src > meta-build && chmod +x meta-build