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gcc: add fallback to condition
``` > pkgsMusl.nix error: attribute 'useLLVM' missing $ nix eval -f . pkgsMusl.pkgsStatic.stdenv.targetPlatform.useLLVM error: attribute 'useLLVM' in selection path 'pkgsMusl.pkgsStatic.stdenv.targetPlatform.useLLVM' not found ```