make flags: building meta-build sed "s@__prefix__@/nix/store/h8k00k84q7dfy4vsb7apgrn6b5x6d3w3-meta-build-env@g;\ s@__datadir__@/nix/store/h8k00k84q7dfy4vsb7apgrn6b5x6d3w3-meta-build-env/share@g;\ s@__PACKAGE__@meta-build-env@g" < meta-build.src > meta-build && chmod +x meta-build