I am building and deploying my liferay theme through liferay-theme-generator
I have sass 3.4.22 version. I have a datepicker.scss version 2.0 in my css folder.
When building it I am having an error build/_css/datepicker.scss (Line 117: Undefined variable: "$gray-lighter".)
In build folder, _variables which contains the variable $gray-lighter was there. Hope someone can give me some light here.
Just an update about this, I was able to fix the issue by adding an import of all variables of bootstrap _variables.scss class in my custom.scss.
Hope it can help others when running into this issue. cheers!