* Using: sun-jdk-1.5
>>> Unpacking source...
>>> Unpacking struts-1.2.9-src.tar.gz to /var/tmp/portage/dev-java/struts-1.2.9-r1/work
tar: A lone zero block at 88403
>>> Source unpacked.
Rewriting source attributes
Using Sax to rewrite the build.xml files
Rewriting ./contrib/struts-chain/build.xml
Rewriting ./contrib/struts-el/build.xml
Rewriting ./contrib/struts-faces/core-library/build.xml
Rewriting ./contrib/struts-faces/example1-webapp/build.xml
Rewriting ./contrib/struts-faces/example2-webapp/build.xml
Rewriting ./contrib/struts-faces/sysclient-app/build.xml
Rewriting ./contrib/struts-faces/systest1-webapp/build.xml
Rewriting ./contrib/struts-faces/build.xml
Rewriting ./struts-examples/mailreader/dist/build.xml
Rewriting ./struts-examples/mailreader/build.xml
Rewriting ./web/blank/WEB-INF/src/build.xml
Rewriting ./build.xml
Rewriting target attributes
Using Sax to rewrite the build.xml files
Rewriting ./contrib/struts-chain/build.xml
Rewriting ./contrib/struts-el/build.xml
Rewriting ./contrib/struts-faces/core-library/build.xml
Rewriting ./contrib/struts-faces/example1-webapp/build.xml
Rewriting ./contrib/struts-faces/example2-webapp/build.xml
Rewriting ./contrib/struts-faces/sysclient-app/build.xml
Rewriting ./contrib/struts-faces/systest1-webapp/build.xml
Rewriting ./contrib/struts-faces/build.xml
Rewriting ./struts-examples/mailreader/dist/build.xml
Rewriting ./struts-examples/mailreader/build.xml
Rewriting ./web/blank/WEB-INF/src/build.xml
Rewriting ./build.xml
>>> Compiling source in /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src ...
 * Using all available ANT_TASKS
Buildfile: build.xml

init:
     [echo] --------- struts 1.2.9 ---------
     [echo] 
     [echo] java.class.path = /usr/share/ant-core/lib/ant-launcher.jar:/opt/sun-jdk-1.5.0.10/lib/tools.jar:/usr/share/junit/lib/junit.jar:/usr/share/ant-nodeps/lib/ant-nodeps.jar:/usr/share/ant-junit/lib/ant-junit.jar:/usr/share/ant-core/lib/xjavac.jar:/usr/share/ant-core/lib/ant.jar:/usr/share/ant-core/lib/junit.jar:/usr/share/ant-core/lib/ant-bootstrap.jar:/usr/share/ant-core/lib/ant-launcher.jar:/usr/share/ant-core/lib/pmd.jar:/usr/share/ant-core/lib/jaxb-xjc.jar
     [echo] java.home = /usr/opt/sun-jdk-1.5.0.10/jre
     [echo] user.home = /root

prepare.library:
    [mkdir] Created dir: /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/library/classes/META-INF
    [mkdir] Created dir: /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/library/classes/META-INF/tlds
    [mkdir] Created dir: /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/library/classes/org/apache/struts/resources
     [copy] Copying 1 file to /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/library/classes/META-INF
     [copy] Copying 1 file to /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/library/classes/META-INF
     [copy] Copying 6 files to /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/library/classes/org/apache/struts/resources
     [copy] Copying 1 file to /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/conf
     [copy] Copying 1 file to /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/library
     [copy] Copying 1 file to /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/library
     [copy] Copying 1 file to /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/library
     [copy] Copying 1 file to /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/library
     [copy] Copying 1 file to /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/library
     [copy] Copying 1 file to /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/library
     [copy] Copying 1 file to /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/library

compile.library:
    [javac] Compiling 277 source files to /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/library/classes
    [javac] /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/src/share/org/apache/struts/tiles/ComponentDefinition.java:276: warning: unmappable character for encoding ASCII
    [javac]      * @param content Attribute value ???
    [javac]                                       ^
    [javac] /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/src/share/org/apache/struts/tiles/ComponentDefinition.java:276: warning: unmappable character for encoding ASCII
    [javac]      * @param content Attribute value ???
    [javac]                                        ^
    [javac] /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/src/share/org/apache/struts/tiles/ComponentDefinition.java:276: warning: unmappable character for encoding ASCII
    [javac]      * @param content Attribute value ???
    [javac]                                         ^
    [javac] Note: Some input files use or override a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] 3 warnings
     [copy] Copying 16 files to /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/library/classes
     [copy] Copying 7 files to /var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/target/library
    [style] Warning: the task name <style> is deprecated. Use <xslt> instead.
    [style] java.lang.ClassNotFoundException: org.apache.tools.ant.taskdefs.optional.TraXLiaison
    [style] 	at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
    [style] 	at java.security.AccessController.doPrivileged(Native Method)
    [style] 	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    [style] 	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    [style] 	at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
    [style] 	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
    [style] 	at java.lang.Class.forName0(Native Method)
    [style] 	at java.lang.Class.forName(Class.java:164)
    [style] 	at org.apache.tools.ant.taskdefs.XSLTProcess.loadClass(XSLTProcess.java:548)
    [style] 	at org.apache.tools.ant.taskdefs.XSLTProcess.resolveProcessor(XSLTProcess.java:533)
    [style] 	at org.apache.tools.ant.taskdefs.XSLTProcess.getLiaison(XSLTProcess.java:785)
    [style] 	at org.apache.tools.ant.taskdefs.XSLTProcess.execute(XSLTProcess.java:300)
    [style] 	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
    [style] 	at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    [style] 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    [style] 	at java.lang.reflect.Method.invoke(Method.java:585)
    [style] 	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105)
    [style] 	at org.apache.tools.ant.Task.perform(Task.java:348)
    [style] 	at org.apache.tools.ant.Target.execute(Target.java:357)
    [style] 	at org.apache.tools.ant.Target.performTasks(Target.java:385)
    [style] 	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1329)
    [style] 	at org.apache.tools.ant.Project.executeTarget(Project.java:1298)
    [style] 	at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
    [style] 	at org.apache.tools.ant.Project.executeTargets(Project.java:1181)
    [style] 	at org.apache.tools.ant.Main.runBuild(Main.java:698)
    [style] 	at org.apache.tools.ant.Main.startAnt(Main.java:199)
    [style] 	at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
    [style] 	at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)

BUILD FAILED
/var/tmp/portage/dev-java/struts-1.2.9-r1/work/struts-1.2.9-src/build.xml:242: java.lang.ClassNotFoundException: org.apache.tools.ant.taskdefs.optional.TraXLiaison

Total time: 10 seconds

!!! ERROR: dev-java/struts-1.2.9-r1 failed.
Call stack:
  ebuild.sh, line 1614:   Called dyn_compile
  ebuild.sh, line 971:   Called qa_call 'src_compile'
  environment, line 4622:   Called src_compile
  struts-1.2.9-r1.ebuild, line 65:   Called eant 'compile.library' '-Dcommons-beanutils.jar=/usr/share/commons-beanutils-1.7/lib/commons-beanutils.jar' '-Dcommons-digester.jar=/usr/share/commons-digester/lib/commons-digester.jar' '-Dcommons-fileupload.jar=/usr/share/commons-fileupload/lib/commons-fileupload.jar' '-Dcommons-logging.jar=/usr/share/commons-logging/lib/commons-logging.jar' '-Dcommons-validator.jar=/usr/share/commons-validator/lib/commons-validator.jar' '-Djakarta-oro.jar=/usr/share/jakarta-oro-2.0/lib/jakarta-oro.jar' '-Dservlet.jar=/usr/share/servletapi-2.3/lib/servlet.jar' '-Dantlr.jar=/usr/share/antlr/lib/antlr.jar'
  java-utils-2.eclass, line 1703:   Called die

!!! eant failed
!!! If you need support, post the topmost build error, and the call stack if relevant.
!!! A complete build log is located at '/var/tmp/portage/dev-java/struts-1.2.9-r1/temp/build.log'.

!!! When you file a bug report, please include the following information:
GENTOO_VM=sun-jdk-1.5  CLASSPATH="" JAVA_HOME="/opt/sun-jdk-1.5.0.10"
JAVACFLAGS="-source 1.4 -target 1.4" COMPILER="javac"
and of course, the output of emerge --info