See addFileArg2.
addFileArg2
pub fn addPrefixedFileArg(run: *Run, prefix: []const u8, lp: std.Build.LazyPath) void
pub fn addPrefixedFileArg(run: *Run, prefix: []const u8, lp: std.Build.LazyPath) void { run.addFileArg2(lp, .{ .prefix = prefix }); }