Liferay Theme & SASS cache problems during build

Extending themes using Liferay Plugins SDK is simple.

Extending Classic theme is not - there is css/.sass-cache folder to cross your plans.

How to fix? Change build.xml file in your theme folder and override build-css target:

<?xml version="1.0"?>
<!DOCTYPE project>

<project name="test-theme" basedir="." default="deploy">
  <import file="../build-common-theme.xml" />

  <property name="theme.parent" value="classic" />

  <target name="build-css">
  <delete file="docroot/css/.sass-cache/main.css" />
  <ant 
            antfile="../build-common-theme.xml" 
            target="build-css" />
  </target>
</project>