Archivo build-common-theme.xml para Liferay 6.2 que incluye el tema welcome-theme para poder crear temas basados de el.

build-common-theme.xml

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

<project name="build-common-theme">
	<import file="../build-common-plugin.xml" />

	<target name="build-css">
		<java
			classname="com.liferay.portal.tools.SassToCssBuilder"
			classpathref="portal.classpath"
			fork="true"
			newenvironment="true"
		>
			<jvmarg value="-Dliferay.lib.portal.dir=${app.server.lib.portal.dir}" />
			<arg value="sass.dir=/" />
			<arg value="sass.docroot.dir=${basedir}/docroot" />
			<arg value="sass.portal.common.dir=${app.server.portal.dir}/html/css/common" />
		</java>
	</target>

	<target name="clean">
		<if>
			<available file="docroot/_diffs" />
			<then>
				<delete includeemptydirs="true" quiet="true" failonerror="false">
					<fileset
						dir="docroot"
						excludes=".gitignore,_diffs.*,_diffs/**,WEB-INF/**"
					/>
				</delete>
			</then>
		</if>

		<antcall target="build-common-plugin.clean" />
	</target>

	<target name="compile">
		<if>
			<available file="docroot/_diffs/images" />
			<then>
				<for param="file">
					<path>
						<fileset
							dir="docroot/_diffs/images"
							includes="**/screenshot.png"
						/>
					</path>
					<sequential>
						<propertyregex input="@{file}" override="yes" property="thumbnail.file" regexp="screenshot\.png" replace="thumbnail\.png" />

						<java
							classname="com.liferay.portal.tools.ThumbnailBuilder"
							classpathref="portal.classpath"
						>
							<arg value="thumbnail.original.file=@{file}" />
							<arg value="thumbnail.thumbnail.file=${thumbnail.file}" />
							<arg value="thumbnail.height=120" />
							<arg value="thumbnail.width=160" />
							<arg value="thumbnail.overwrite=false" />
						</java>
					</sequential>
				</for>
			</then>
		</if>

		<if>
			<not>
				<isset property="theme.type" />
			</not>
			<then>
				<property name="theme.type" value="vm" />
			</then>
		</if>

		<if>
			<equals arg1="${theme.parent}" arg2="_unstyled" />
			<then>
				<copy todir="docroot" overwrite="true" preservelastmodified="true">
					<fileset
						dir="${app.server.portal.dir}/html/themes/_unstyled"
						excludes="templates/**"
					/>
				</copy>

				<copy todir="docroot/templates" overwrite="true" preservelastmodified="true">
					<fileset
						dir="${app.server.portal.dir}/html/themes/_unstyled/templates"
						excludes="init.${theme.type}"
						includes="*.${theme.type}"
					/>
				</copy>
			</then>
			<elseif>
				<equals arg1="${theme.parent}" arg2="_styled" />
				<then>
					<copy todir="docroot" overwrite="true" preservelastmodified="true">
						<fileset
							dir="${app.server.portal.dir}/html/themes/_unstyled"
							excludes="templates/**"
						/>
					</copy>

					<copy todir="docroot/templates" overwrite="true" preservelastmodified="true">
						<fileset
							dir="${app.server.portal.dir}/html/themes/_unstyled/templates"
							excludes="init.${theme.type}"
							includes="*.${theme.type}"
						/>
					</copy>

					<copy todir="docroot" overwrite="true" preservelastmodified="true">
						<fileset
							dir="${app.server.portal.dir}/html/themes/_styled"
						/>
					</copy>
				</then>
			</elseif>
			<elseif>
				<equals arg1="${theme.parent}" arg2="classic" />
				<then>
					<copy todir="docroot" overwrite="true" preservelastmodified="true">
						<fileset
							dir="${app.server.portal.dir}/html/themes/classic"
							excludes="**/.sass-cache/**,_diffs/**,templates/**"
						/>
					</copy>

					<copy todir="docroot/templates" overwrite="true" preservelastmodified="true">
						<fileset
							dir="${app.server.portal.dir}/html/themes/classic/templates"
							includes="*.${theme.type}"
						/>
					</copy>
				</then>
			</elseif>
			<elseif>
				<equals arg1="${theme.parent}" arg2="welcome-theme" />
				 <then>
					 <copy todir="docroot" overwrite="true" preservelastmodified="true">
						 <fileset
							 dir="${app.server.portal.dir}/../welcome-theme"
							 excludes="**/.sass-cache/**,_diffs/**,templates/**,WEB-INF/**"
						 />
					 </copy>

					<copy todir="docroot/templates" overwrite="true" preservelastmodified="true">
						<fileset
							dir="${app.server.portal.dir}/../welcome-theme/templates"
							includes="*.${theme.type}"
						/>
					</copy>
				</then>
			</elseif>
			<elseif>
				<equals arg1="${theme.parent}" arg2="control_panel" />
				<then>
					<copy todir="docroot" overwrite="true" preservelastmodified="true">
						<fileset
							dir="${app.server.portal.dir}/html/themes/control_panel"
							excludes="**/.sass-cache/**,_diffs/**,templates/**"
						/>
					</copy>

					<copy todir="docroot/templates" overwrite="true" preservelastmodified="true">
						<fileset
							dir="${app.server.portal.dir}/html/themes/control_panel/templates"
							includes="*.${theme.type}"
						/>
					</copy>
				</then>
			</elseif>
			<elseif>
				<isset property="theme.parent" />
				<then>
					<ant dir="${theme.parent}" target="compile" inheritAll="false" />

					<copy todir="docroot" overwrite="true" preservelastmodified="true">
						<fileset
							dir="${theme.parent}/docroot"
							excludes="**/.sass-cache/**,_diffs/**,WEB-INF/*.properties,WEB-INF/*.xml"
						/>
					</copy>
				</then>
			</elseif>
		</if>

		<if>
			<available file="docroot/_diffs" />
			<then>
				<copy todir="docroot" overwrite="true" preservelastmodified="true">
					<fileset
						dir="docroot/_diffs"
					/>
				</copy>
			</then>
		</if>

		<if>
			<available file="docroot/WEB-INF/src" />
			<then>
				<antcall target="build-common-plugin.compile" />
			</then>
			<else>
				<if>
					<available file="overwrite" />
					<then>
						<copy overwrite="true" preservelastmodified="true" todir="docroot">
							<fileset dir="overwrite" />
						</copy>
					</then>
				</if>
			</else>
		</if>
	</target>

	<target name="war" depends="compile">
		<antcall target="build-css" />

		<if>
			<not>
				<available file="docroot/images/screenshot.png" />
			</not>
			<then>
				<echo>screenshot.png does not exist.</echo>
			</then>
		</if>

		<if>
			<not>
				<available file="docroot/images/thumbnail.png" />
			</not>
			<then>
				<echo>thumbnail.png does not exist.</echo>
			</then>
		</if>

		<mkdir dir="${sdk.dir}/dist" />

		<delete file="${plugin.file}" />

		<zip
			basedir="docroot"
			destfile="${plugin.file}"
			excludes="_diffs.*,_diffs/**,${plugins.war.excludes}"
		/>
	</target>
</project>