make flags: building meta-build sed "s@__prefix__@/nix/store/k3ml058fchd3prwfpwrk1qwgsk9rfkrx-meta-build-env@g;\ s@__datadir__@/nix/store/k3ml058fchd3prwfpwrk1qwgsk9rfkrx-meta-build-env/share@g;\ s@__PACKAGE__@meta-build-env@g" < meta-build.src > meta-build && chmod +x meta-build