make flags: building meta-build sed "s@__prefix__@/nix/store/89z4d9wdwv8n80r8daf4zgx2km16kpb0-meta-build-env@g;\ s@__datadir__@/nix/store/89z4d9wdwv8n80r8daf4zgx2km16kpb0-meta-build-env/share@g;\ s@__PACKAGE__@meta-build-env@g" < meta-build.src > meta-build && chmod +x meta-build