https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121491
--- Comment #3 from Dave Blanchard <dave at killthe dot net> --- Oops, I forgot to add the error message, sorry: d21: error: cannot find source code for runtime library file 'object.d' d21: note: dmd might not be correctly installed. Run 'dmd -man' for installation instructions. d21: note: config file: not found "not correctly installed" is right; all the target-specific .d files are missing.