Ebuild 0.70 has a missing or malformed copyright/licensing header.
[Notice] Ebuild 0.70 has an invalid header. It should start with a valid copyright line (e.g., '# Copyright YEARS MAIN-CONTRIBUTOR') and the GPLv2 distribution text followed by an empty line.
[Warning] Ebuild 0.70 has a line exceeding 80 positions on line 7.
[Notice] Package has only unstable keywords for arch(es): [ amd64 ], all versions are unstable: [ 0.70 ]
[Error] Invalid or missing metadata.xml: open sci-electronics/yosys/metadata.xml: file does not exist