I propose you to delete `@clearfix`'s default value, but that's a personal opinion.
To avoid duplicated code, you can simply do
```
.make-container(@gutter: @grid-gutter-width; @clearfix: true) when (@clearfix) { 
  .clearfix();
  .make-container(@gutter; true);
}

.make-container(@gutter: @grid-gutter-width; @clearfix: true) { 
  // Common stuff
}
```