Why don't mixins work in compass?

Question

css

Installed sass and compass.
@import "compass/reset"; - works, but
@include display-flex; for example, it does not work, as well as other mixins.
Why is that?

Answer 1

There are only two options here.
1. Connect the entire compass at once - @import compass;. And forget that there are some modules. In this case, the compilation speed will slightly decrease due to the huge number of imports.
2. Connect the modules used - @import 'compass/css3/flexbox';
compass-style.org/reference/compass/css3