Using rubygems to compile compass/sass with maven

pom.xml

<?xml version="1.0"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.arcusys</groupId>
    <artifactId>theme</artifactId>
    <packaging>war</packaging>
    <name>theme Theme</name>
    <version>1.0-SNAPSHOT</version>
    <build>
        <finalName>${project.artifactId}</finalName>
        <plugins>
            <plugin>
                <groupId>de.saumya.mojo</groupId>
                <artifactId>gem-maven-plugin</artifactId>
                <version>1.0.2</version>
                <executions>
                    <execution>
                        <id>compass-compile</id>
                        <goals>
                            <goal>exec</goal>
                        </goals>
                        <phase>generate-sources</phase>
                        <configuration>
                            <execArgs>${project.build.directory}/rubygems/bin/compass compile
                                --sass-dir ${basedir}/src/main/resources/bootstrap/ --boring
                                --css-dir ${basedir}/src/main/webapp/css/ --time ${compass.options}
                            </execArgs>
                        </configuration>
                    </execution>
                </executions>
                <dependencies>
                    <dependency>
                        <groupId>rubygems</groupId>
                        <artifactId>compass</artifactId>
                        <version>0.12.6</version>
                        <type>gem</type>
                    </dependency>
                </dependencies>
            </plugin>
            <plugin>
                <groupId>com.liferay.maven.plugins</groupId>
                <artifactId>liferay-maven-plugin</artifactId>
                <version>${liferay.version}</version>
                <executions>
                    <execution>
                        <phase>generate-sources</phase>
                        <goals>
                            <!--<goal>build-css</goal> remove this to disable Liferay's SASS compiler-->
                            <goal>theme-merge</goal>
                            <goal>build-thumbnail</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <autoDeployDir>${liferay.auto.deploy.dir}</autoDeployDir>
                    <appServerDeployDir>${liferay.app.server.deploy.dir}</appServerDeployDir>
                    <appServerLibGlobalDir>${liferay.app.server.lib.global.dir}</appServerLibGlobalDir>
                    <appServerPortalDir>${liferay.app.server.portal.dir}</appServerPortalDir>
                    <liferayVersion>${liferay.version}</liferayVersion>
                    <parentTheme>${liferay.theme.parent}</parentTheme>
                    <pluginType>theme</pluginType>
                    <themeType>${liferay.theme.type}</themeType>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-resources-plugin</artifactId>
                <version>2.6</version>
                <configuration>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>com.liferay.portal</groupId>
            <artifactId>portal-service</artifactId>
            <version>${liferay.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.liferay.portal</groupId>
            <artifactId>util-bridges</artifactId>
            <version>${liferay.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.liferay.portal</groupId>
            <artifactId>util-taglib</artifactId>
            <version>${liferay.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.liferay.portal</groupId>
            <artifactId>util-java</artifactId>
            <version>${liferay.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.portlet</groupId>
            <artifactId>portlet-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.4</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
    <profiles>
        <profile>
            <id>development</id>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
            <properties>
                <compass.options>-e development</compass.options>
            </properties>
        </profile>
        <profile>
            <id>production</id>
            <properties>
                <compass.options>-e production --force</compass.options>
            </properties>
        </profile>
    </profiles>
    <properties>
        <liferay.auto.deploy.dir>../bundles/deploy</liferay.auto.deploy.dir>
        <liferay.version>6.1.30</liferay.version>
        <liferay.theme.parent>_styled</liferay.theme.parent>
        <liferay.theme.type>ftl</liferay.theme.type>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    </properties>
    <repositories>
    <repository>
        <id>rubygems-release</id>
        <url>http://rubygems-proxy.torquebox.org/releases</url>
    </repository>
</repositories>
</project>