SCSS doesn't compile...Bootstrap inclusion error

[tripslip38]

I was hoping it would be possible to run the sass command line utility to recompile the SCSS files to the public CSS folder but it has an issue.

sass resources/styles/tweeki.scss:public/awesome/css/all.min.css --style=compressed

Result:

Error: File to import not found or unreadable: ~bootstrap/scss/bootstrap.
        on line 3 of resources/styles/tweeki.scss

A Googling on the error turns up some deprecated inclusion format for the tilde. I have to admit I don't get it.

I did find your method for adding a custom CSS via an extension but this seems cleaner to be able to use SCSS.