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Description of problem: udis86 lists YASM as a build dependency. YASM is deprecated due to being unmaintained upstream. Please switch to NASM. See https://fedoraproject.org/wiki/Changes/DeprecateYASM for more details. Version-Release number of selected component (if applicable): udis86-1.7.2-27.56ff6c8.fc43
udis86 fails to detect "yasm" after your change because of the difference in output, so it effectively builds without yasm (and doesn't use nasm, either). So please either drop nasm dependency, too, or adapt the source to make use of it. It's not a drop-in replacement.
Whoops, should have paid more close attention. Thanks for the heads up. Will fix.