taskdef class org.apache.xerces.util.XJavac cannot be found

 While tryinng to compile xerces sources, I am getting that
"util.XJavac cannot be" found error. Why is it happening? How can I
troubleshoot it?
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 thanks
 lbrtchx
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$ ant -verbose
Apache Ant(TM) version 1.8.4 compiled on October 13 2012
Trying the default build file: build.xml
Buildfile: /media/sdb1/prjx/kd/java/SAX2/xerces-2_11_0/build.xml
Detected Java version: 1.7 in: /media/sdb1/inst/sw/jdk/x86/1.7.0_07/jre
Detected OS: Linux
parsing buildfile
/media/sdb1/prjx/kd/java/SAX2/xerces-2_11_0/build.xml with URI =
file:/media/sdb1/prjx/kd/java/SAX2/xerces-2_11_0/build.xml
Project base dir set to: /media/sdb1/prjx/kd/java/SAX2/xerces-2_11_0
parsing buildfile
jar:file:/media/sdb1/inst/sw/apache-ant-1.8.4/lib/ant.jar!/org/apache/tools/ant/antlib.xml
with URI = jar:file:/media/sdb1/inst/sw/apache-ant-1.8.4/lib/ant.jar!/org/apache/tools/ant/antlib.xml
from a zip file
dropping /media/sdb1/prjx/kd/java/SAX2/xerces-2_11_0/tools/bin/xjavac.jar
from path as it doesn't exist

BUILD FAILED
/media/sdb1/prjx/kd/java/SAX2/xerces-2_11_0/build.xml:42: taskdef
class org.apache.xerces.util.XJavac cannot be found
 using the classloader AntClassLoader[]
 at org.apache.tools.ant.taskdefs.Definer.addDefinition(Definer.java:622)
 at org.apache.tools.ant.taskdefs.Definer.execute(Definer.java:239)
 at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:601)
 at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
 at org.apache.tools.ant.Task.perform(Task.java:348)
 at org.apache.tools.ant.Target.execute(Target.java:392)
 at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:180)
 at org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.java:82)
 at org.apache.tools.ant.Main.runBuild(Main.java:795)
 at org.apache.tools.ant.Main.startAnt(Main.java:217)
 at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
 at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)
Caused by: java.lang.ClassNotFoundException: org.apache.xerces.util.XJavac
 at org.apache.tools.ant.AntClassLoader.findClassInComponents(AntClassLoader.java:1365)
 at org.apache.tools.ant.AntClassLoader.findClass(AntClassLoader.java:1315)
 at org.apache.tools.ant.AntClassLoader.loadClass(AntClassLoader.java:1068)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
 at java.lang.Class.forName0(Native Method)
 at java.lang.Class.forName(Class.java:264)
 at org.apache.tools.ant.taskdefs.Definer.addDefinition(Definer.java:594)
 ... 15 more

Total time: 0 seconds

$ ant -p
Buildfile: /media/sdb1/prjx/kd/java/SAX2/xerces-2_11_0/build.xml
/media/sdb1/prjx/kd/java/SAX2/xerces-2_11_0/build.xml:42: taskdef
class org.apache.xerces.util.XJavac cannot be found
 using the classloader AntClassLoader[]


$ ls -l bin/xjavac.jar
ls: cannot access bin/xjavac.jar: No such file or directory

$ cat /media/sdb1/prjx/kd/java/SAX2/xerces-2_11_0/build.xml | grep xjavac
  <taskdef name="xjavac" classname="org.apache.xerces.util.XJavac">
      <pathelement location="${tools.dir}/bin/xjavac.jar"/>
    <property name='jar.xjavac' value='xjavac.jar'/>
    <echo message=" xjavac-jar --> generates the xjavac.jar file"/>
    <xjavac srcdir="${build.src}"
    <xjavac srcdir="${build.samples}"
    <xjavac srcdir="${build.tests}"
    <xjavac srcdir="${build.src}"
    <xjavac srcdir="${build.src}"
        <xjavac srcdir="${build.src}"
  <!-- Builds the xjavac jar file                                          -->
  <target name="xjavac-jar" depends="prepare">
    <jar jarfile="${build.dir}/${jar.xjavac}"

$ cat /media/sdb1/prjx/kd/java/SAX2/xerces-2_11_0/build.xml | grep XJavac
  <taskdef name="xjavac" classname="org.apache.xerces.util.XJavac">
    <copy file="${tools.dir}/src/XJavac.java"
          tofile="${build.src}/org/apache/xerces/util/XJavac.java"/>
         includes="org/apache/xerces/util/XJavac.class">

$ ls -l build.sh
-rw-r--r-- 1 knoppix knoppix 2517 Nov 26  2010 build.sh

$ chmod +x build.sh

knoppix@Microknoppix:/media/sdb1/prjx/kd/java/SAX2/xerces-2_11_0$ ls -l build.sh
-rwxr-xr-x 1 knoppix knoppix 2517 Nov 26  2010 build.sh

$ sh build.sh all
build.sh: line 20: $'\r': command not found
build.sh: line 21: $'echo\r': command not found
Xerces-Java Build System
------------------------
build.sh: line 24: $'\r': command not found
build.sh: line 35: syntax error near unexpected token `$'in\r''
'uild.sh: line 35: `case "`uname`" in
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