seam-gen war project cannot be built with ant 1.6.5

Seam 2.0.2-FP requires ant 1.6.5, otherwise you get the warning
"/tmp/seam-gen.27415/jboss-eap-4.3/seam2/build.xml:9: You are using Apache Ant version 1.7.0 compiled on December 13 2006. You must use Ant 1.6.5 to build Seam FP."

However, the build.xml file used for war projects (build-war.xml) contains the following line

<available property="groovy.present" value="true" file="" searchparents="true">

in which the "searchparents" attribute is allowed since ant 1.7.0. As a result, you'll get

/mnt/hudson_workspace/workspace/seam-gen-eap4.3FP/jdk/java16_default/label/vmg18-rhel5-x86_64/projects/seamGenTestAppRichWarE001/build.xml:51: The <available> type doesn't support the "searchparents" attribute.

when using the build file with ant 1.6.5