Bumping LibSass to 3.6.4. which should be regressions free, since LibSass
had unfortunately quite a few serious regressions after 3.6.0.
https://github.com/sass/libsass/releases/tag/3.6.4
https://github.com/sass/libsass/releases/tag/3.6.3
https://github.com/sass/libsass/releases/tag/3.6.2
https://github.com/sass/libsass/releases/tag/3.6.1
That's the reason why perl-libsass 3.6.1 was never officially released on CPAN!
If you get a warning about "compound selectors may no longer be extended", you should carefully check
for differences in the generated output. Chances are that your resulting stylesheet contains "unnecessary" complex selectors. While this is semantically more correct than before, it can add a lot to the resulting css
size and also performance wise to produce those results. Since Sass will deprecate extending compound
selectors anyway, you are encouraged to get rid to this warning by only extending simple selectors.