This plugin adds support for SCSS stylesheets to wp_enqueue_style. Just enqueue your styleheet using wp_enqueue_style and it will automatically be compiled for you when neccessary.
Variables can be injected using the sassify_compiler_variables filter.
SCSSPHP
This plugin uses the latest version of scssphp, modified to PHP 5.2.
It implements SCSS 3.2.12. It does not implement the SASS syntax, only the SCSS syntax.
Bug Submission
https://github.com/funkjedi/sassify/issues/