diff --git a/ant/org.eclipse.ant.core/META-INF/MANIFEST.MF b/ant/org.eclipse.ant.core/META-INF/MANIFEST.MF
index 1ee8544c7c5..3707d2e7992 100644
--- a/ant/org.eclipse.ant.core/META-INF/MANIFEST.MF
+++ b/ant/org.eclipse.ant.core/META-INF/MANIFEST.MF
@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.ant.core; singleton:=true
-Bundle-Version: 3.7.800.qualifier
+Bundle-Version: 3.7.900.qualifier
 Bundle-Activator: org.eclipse.ant.core.AntCorePlugin
 Bundle-Vendor: %providerName
 Bundle-Localization: plugin
diff --git a/ant/org.eclipse.ant.core/buildfiles/buildExtraJAR.xml b/ant/org.eclipse.ant.core/buildfiles/buildExtraJAR.xml
index dcadff155cd..9a6927d9292 100644
--- a/ant/org.eclipse.ant.core/buildfiles/buildExtraJAR.xml
+++ b/ant/org.eclipse.ant.core/buildfiles/buildExtraJAR.xml
@@ -8,22 +8,29 @@
      https://www.eclipse.org/legal/epl-2.0/
 
      SPDX-License-Identifier: EPL-2.0
-    
+
      Contributors:
          IBM Corporation - initial API and implementation
  -->
 
 <project name="Build Ant support JAR" default="build" basedir="..">
 
-	<target name="build" description="Cleans, builds and refreshes the impacted resources" depends="clean, lib/antsupportlib.jar"/>
+	<target name="build" description="Builds and refreshes the impacted resources" depends="lib/antsupportlib.jar"/>
 
 	<target name="init">
 		<property name="temp.folder" value="${basedir}/temp.folder"/>
 		<property name="build.result.folder" value="${basedir}"/>
 	</target>
 
-	<target name="lib/antsupportlib.jar" depends="init" description="Creates the lib/antsupportlib.jar">
+	<target name="checkSourceUpToDate" depends="init">
+		<uptodate property="jarUpToDate" targetfile="${build.result.folder}/lib/antsupportlib.jar">
+			<srcfiles dir="${basedir}/src_ant/"  includes="**/*"/>
+		</uptodate>
+	</target>
+
+	<target name="lib/antsupportlib.jar" depends="init, checkSourceUpToDate" unless="jarUpToDate" description="Creates the lib/antsupportlib.jar">
 		<property name="destdir" value="${temp.folder}/lib/antsupportlib.jar.bin"/>
+		<delete dir="${temp.folder}"/>
 		<delete dir="${destdir}"/>
 		<mkdir dir="${destdir}"/>
 		<!-- copy necessary resources -->
diff --git a/ant/org.eclipse.ant.launching/META-INF/MANIFEST.MF b/ant/org.eclipse.ant.launching/META-INF/MANIFEST.MF
index 6eacd3cda2c..2792403d410 100644
--- a/ant/org.eclipse.ant.launching/META-INF/MANIFEST.MF
+++ b/ant/org.eclipse.ant.launching/META-INF/MANIFEST.MF
@@ -3,7 +3,7 @@ Bundle-ManifestVersion: 2
 Bundle-Localization: plugin
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.ant.launching;singleton:=true
-Bundle-Version: 1.4.1000.qualifier
+Bundle-Version: 1.4.1100.qualifier
 Bundle-Activator: org.eclipse.ant.internal.launching.AntLaunching
 Require-Bundle: org.eclipse.core.runtime;bundle-version="[3.29.0,4.0.0)",
  org.eclipse.debug.core;bundle-version="[3.12.0,4.0.0)",
diff --git a/ant/org.eclipse.ant.launching/buildfiles/buildCommonDebug.xml b/ant/org.eclipse.ant.launching/buildfiles/buildCommonDebug.xml
index 293ec16dbab..4da743ff0a9 100644
--- a/ant/org.eclipse.ant.launching/buildfiles/buildCommonDebug.xml
+++ b/ant/org.eclipse.ant.launching/buildfiles/buildCommonDebug.xml
@@ -8,26 +8,27 @@
      https://www.eclipse.org/legal/epl-2.0/
 
      SPDX-License-Identifier: EPL-2.0
-    
+
      Contributors:
          IBM Corporation - initial API and implementation
  -->
 
 <project name="Build Ant common debug support JAR" default="build" basedir="..">
-	
-	<target name="build" description="Cleans, builds and refreshes" depends="clean, lib/antdebuglib.jar"/>
+
+	<target name="build" description="Builds and refreshes" depends="lib/antdebuglib.jar"/>
 
 	<target name="init" depends="properties">
 		<property name="temp.folder" value="${basedir}/temp.folder"/>
 		<property name="build.result.folder" value="${basedir}"/>
 	</target>
-	
+
 	<target name="properties" if="eclipse.running">
 		<property name="build.compiler" value="org.eclipse.jdt.core.JDTCompilerAdapter"/>
 	</target>
-	
-	<target name="lib/antdebuglib.jar" description= "Creates the antdebug.jar" depends="init">
+
+	<target name="lib/antdebuglib.jar" description= "Creates the antdebug.jar" depends="init, checkSourceUpToDate" unless="jarUpToDate">
 		<property name="destdir" value="${temp.folder}/lib/antdebug.jar.bin"/>
+		<delete dir="${temp.folder}"/>
 		<delete dir="${destdir}"/>
 		<mkdir dir="${destdir}"/>
 		<javac release="17" destdir="${destdir}" failonerror="true" verbose="false" debug="on" includeAntRuntime="yes"
@@ -36,7 +37,7 @@
 			<compilerarg value="-Xlint"/>
 		</javac>
 		<copy file="${basedir}/common_bin/META-INF/eclipse.inf" tofile="${destdir}/META-INF/eclipse.inf"/>
-		
+
 		<mkdir dir="${build.result.folder}/lib"/>
 		<jar destfile="${build.result.folder}/lib/antdebug.jar" basedir="${destdir}"/>
 		<delete dir="${temp.folder}"/>
@@ -46,7 +47,13 @@
 		<delete file="${build.result.folder}/lib/antdebug.jar"/>
 		<delete dir="${temp.folder}"/>
 	</target>
-	
+
+	<target name="checkSourceUpToDate" depends="init">
+		<uptodate property="jarUpToDate" targetfile="${build.result.folder}/lib/antdebug.jar">
+			<srcfiles dir="${basedir}/common" includes="**/*"/>
+		</uptodate>
+	</target>
+
 	<!-- Empty target for "After a Clean" task (we don't want to rebuild the Jar here, e.g. on checkout). -->
 	<target name="after_clean"/>
-</project>
+</project>
\ No newline at end of file
diff --git a/ant/org.eclipse.ant.launching/buildfiles/buildLoggers.xml b/ant/org.eclipse.ant.launching/buildfiles/buildLoggers.xml
index 88cb39a9ea6..93ef633e346 100644
--- a/ant/org.eclipse.ant.launching/buildfiles/buildLoggers.xml
+++ b/ant/org.eclipse.ant.launching/buildfiles/buildLoggers.xml
@@ -8,22 +8,29 @@
      https://www.eclipse.org/legal/epl-2.0/
 
      SPDX-License-Identifier: EPL-2.0
-    
+
      Contributors:
          IBM Corporation - initial API and implementation
  -->
 
 <project name="Build Ant loggers support JAR" default="build" basedir="..">
-	
-	<target name="build" description="Cleans, builds and refreshes" depends="clean, lib/loggerslib.jar"/>
+
+	<target name="build" description="Cleans, builds and refreshes" depends="lib/loggerslib.jar"/>
 
 	<target name="init">
 		<property name="temp.folder" value="${basedir}/temp.folder"/>
 		<property name="build.result.folder" value="${basedir}"/>
 	</target>
 
-	<target name="lib/loggerslib.jar" description= "Creates the loggers.jar" depends="init">
+	<target name="checkSourceUpToDate">
+		<uptodate property="jarUpToDate" targetfile="${build.result.folder}/lib/loggers.jar">
+			<srcfiles dir="${basedir}/loggers/" includes="**/*"/>
+		</uptodate>
+	</target>
+
+	<target name="lib/loggerslib.jar" description= "Creates the loggers.jar" depends="init, checkSourceUpToDate" unless="jarUpToDate">
 		<property name="destdir" value="${temp.folder}/lib/loggers.jar.bin"/>
+		<delete dir="${temp.folder}"/>
 		<delete dir="${destdir}"/>
 		<mkdir dir="${destdir}"/>
 		<!-- copy necessary class files resources -->
@@ -39,4 +46,4 @@
 		<delete file="${build.result.folder}/lib/loggers.jar"/>
 		<delete dir="${temp.folder}"/>
 	</target>
-</project>
+</project>
\ No newline at end of file
diff --git a/ant/org.eclipse.ant.launching/buildfiles/buildRemote.xml b/ant/org.eclipse.ant.launching/buildfiles/buildRemote.xml
index ecb6f944a05..4eddca91d14 100644
--- a/ant/org.eclipse.ant.launching/buildfiles/buildRemote.xml
+++ b/ant/org.eclipse.ant.launching/buildfiles/buildRemote.xml
@@ -8,26 +8,33 @@
      https://www.eclipse.org/legal/epl-2.0/
 
      SPDX-License-Identifier: EPL-2.0
-    
+
      Contributors:
          IBM Corporation - initial API and implementation
  -->
 
 <project name="Build Ant remote support JAR" default="build" basedir="..">
-	
-	<target name="build" description="Cleans, builds and refreshes" depends="clean, lib/remotelib.jar"/>
+
+	<target name="build" description="Builds and refreshes" depends="lib/remotelib.jar"/>
 
 	<target name="init" depends="properties">
 		<property name="temp.folder" value="${basedir}/temp.folder"/>
 		<property name="build.result.folder" value="${basedir}"/>
 	</target>
-	
+
 	<target name="properties" if="eclipse.running">
 		<property name="build.compiler" value="org.eclipse.jdt.core.JDTCompilerAdapter"/>
 	</target>
-	
-	<target name="lib/remotelib.jar" description= "Creates the remote.jar" depends="init">
+
+	<target name="checkSourceUpToDate">
+		<uptodate property="jarUpToDate" targetfile="${build.result.folder}/lib/remote.jar">
+			<srcfiles dir="${basedir}/remote" includes="**/*"/>
+		</uptodate>
+	</target>
+
+	<target name="lib/remotelib.jar" description="Creates the remote.jar" depends="init, checkSourceUpToDate" unless="jarUpToDate">
 		<property name="destdir" value="${temp.folder}/lib/remote.jar.bin"/>
+		<delete dir="${temp.folder}"/>
 		<delete dir="${destdir}"/>
 		<mkdir dir="${destdir}"/>
 		<javac release="17" destdir="${destdir}" failonerror="true" verbose="false" debug="on" includeAntRuntime="yes"
@@ -46,7 +53,7 @@
 		<delete file="${build.result.folder}/lib/remote.jar"/>
 		<delete dir="${temp.folder}"/>
 	</target>
-	
+
 	<!-- Empty target for "After a Clean" task (we don't want to rebuild the Jar here, e.g. on checkout). -->
 	<target name="after_clean"/>
-</project>
+</project>
\ No newline at end of file
diff --git a/ant/org.eclipse.ant.tests.core/META-INF/MANIFEST.MF b/ant/org.eclipse.ant.tests.core/META-INF/MANIFEST.MF
index 91537bc0d99..9d492517091 100644
--- a/ant/org.eclipse.ant.tests.core/META-INF/MANIFEST.MF
+++ b/ant/org.eclipse.ant.tests.core/META-INF/MANIFEST.MF
@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.ant.tests.core; singleton:=true
-Bundle-Version: 3.8.0.qualifier
+Bundle-Version: 3.8.100.qualifier
 Bundle-ClassPath: anttestscore.jar
 Bundle-Activator: org.eclipse.ant.tests.core.testplugin.AntTestPlugin
 Bundle-Vendor: %providerName
diff --git a/ant/org.eclipse.ant.tests.core/buildfiles/buildAntTestsSupportJAR.xml b/ant/org.eclipse.ant.tests.core/buildfiles/buildAntTestsSupportJAR.xml
index 9962fd91d95..9d3a0d43380 100644
--- a/ant/org.eclipse.ant.tests.core/buildfiles/buildAntTestsSupportJAR.xml
+++ b/ant/org.eclipse.ant.tests.core/buildfiles/buildAntTestsSupportJAR.xml
@@ -8,22 +8,29 @@
      https://www.eclipse.org/legal/epl-2.0/
 
      SPDX-License-Identifier: EPL-2.0
-    
+
      Contributors:
          IBM Corporation - initial API and implementation
  -->
 
 <project name="build tests support jar" default="build" basedir="..">
 
-	<target name="build" description="Removes all build artifacts, recreates the support jar, and refreshes this plugin's resources" depends="clean, lib/antTestsSupport.jar"/>
+	<target name="build" description="Builds the support jar if needed" depends="lib/antTestsSupport.jar"/>
 
 	<target name="init">
 		<property name="temp.folder" value="${basedir}/temp.folder"/>
 		<property name="build.result.folder" value="${basedir}"/>
 	</target>
 
-	<target name="lib/antTestsSupport.jar" depends="init" description= "Builds the support JAR">
+	<target name="checkSourceUpToDate" depends="init">
+		<uptodate property="jarUpToDate" targetfile="${build.result.folder}/lib/antTestsSupport.jar">
+			<srcfiles dir="${basedir}/test support/" includes="**/*"/>
+		</uptodate>
+	</target>
+
+	<target name="lib/antTestsSupport.jar" depends="checkSourceUpToDate" unless="jarUpToDate" description="Builds the support JAR">
 		<property name="destdir" value="${temp.folder}/lib/antTestsSupport.jar.bin"/>
+		<delete dir="${temp.folder}"/>
 		<delete dir="${destdir}"/>
 		<mkdir dir="${destdir}"/>
 		<!-- copy necessary resources -->
@@ -39,4 +46,4 @@
 		<delete file="${build.result.folder}/lib/antTestsSupport.jar"/>
 		<delete dir="${temp.folder}"/>
 	</target>
-</project>
+</project>
\ No newline at end of file
diff --git a/ant/org.eclipse.ant.tests.ui/META-INF/MANIFEST.MF b/ant/org.eclipse.ant.tests.ui/META-INF/MANIFEST.MF
index 4c6fda9cf94..0e13e7be4a0 100644
--- a/ant/org.eclipse.ant.tests.ui/META-INF/MANIFEST.MF
+++ b/ant/org.eclipse.ant.tests.ui/META-INF/MANIFEST.MF
@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.ant.tests.ui; singleton:=true
-Bundle-Version: 3.12.400.qualifier
+Bundle-Version: 3.12.500.qualifier
 Bundle-ClassPath: anttestsui.jar
 Bundle-Vendor: %providerName
 Bundle-Localization: plugin
diff --git a/ant/org.eclipse.ant.tests.ui/buildfiles/buildAntTestsSupportJAR.xml b/ant/org.eclipse.ant.tests.ui/buildfiles/buildAntTestsSupportJAR.xml
index fc62deeea16..382904cc579 100644
--- a/ant/org.eclipse.ant.tests.ui/buildfiles/buildAntTestsSupportJAR.xml
+++ b/ant/org.eclipse.ant.tests.ui/buildfiles/buildAntTestsSupportJAR.xml
@@ -8,22 +8,29 @@
      https://www.eclipse.org/legal/epl-2.0/
 
      SPDX-License-Identifier: EPL-2.0
-    
+
      Contributors:
          IBM Corporation - initial API and implementation
  -->
 
 <project name="build tests support jar" default="build" basedir="..">
 
-	<target name="build" description="Removes all build artifacts, recreates the support jar, and refreshes this plugin's resources" depends="clean, lib/antUITestsSupport.jar"/>
+	<target name="build" description="Builds the support jar if needed" depends="lib/antUITestsSupport.jar"/>
 
 	<target name="init">
 		<property name="temp.folder" value="${basedir}/temp.folder"/>
 		<property name="build.result.folder" value="${basedir}"/>
 	</target>
 
-	<target name="lib/antUITestsSupport.jar" depends="init" description= "Builds the support JAR">
+	<target name="checkSourceUpToDate" depends="init" description="Checks if the JAR is up to date with the source">
+		<uptodate property="jarUpToDate" targetfile="${build.result.folder}/lib/antUITestsSupport.jar">
+			<srcfiles dir="${basedir}/test support/" includes="**/*"/>
+		</uptodate>
+	</target>
+
+	<target name="lib/antUITestsSupport.jar" depends="init, checkSourceUpToDate" unless="jarUpToDate" description="Builds the support JAR">
 		<property name="destdir" value="${temp.folder}/lib/antUITestsSupport.jar.bin"/>
+		<delete dir="${temp.folder}"/>
 		<delete dir="${destdir}"/>
 		<mkdir dir="${destdir}"/>
 		<!-- copy necessary resources -->
@@ -39,4 +46,4 @@
 		<delete file="${build.result.folder}/lib/antUITestsSupport.jar"/>
 		<delete dir="${temp.folder}"/>
 	</target>
-</project>
+</project>
\ No newline at end of file
diff --git a/ant/org.eclipse.ant.ui/META-INF/MANIFEST.MF b/ant/org.eclipse.ant.ui/META-INF/MANIFEST.MF
index 8a4359cd841..19d587308ee 100644
--- a/ant/org.eclipse.ant.ui/META-INF/MANIFEST.MF
+++ b/ant/org.eclipse.ant.ui/META-INF/MANIFEST.MF
@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.ant.ui; singleton:=true
-Bundle-Version: 3.10.400.qualifier
+Bundle-Version: 3.10.500.qualifier
 Bundle-Activator: org.eclipse.ant.internal.ui.AntUIPlugin
 Bundle-Vendor: %providerName
 Bundle-Localization: plugin
diff --git a/ant/org.eclipse.ant.ui/buildfiles/buildExtraJAR.xml b/ant/org.eclipse.ant.ui/buildfiles/buildExtraJAR.xml
index 0c87b9c8490..f54bbee3ccd 100644
--- a/ant/org.eclipse.ant.ui/buildfiles/buildExtraJAR.xml
+++ b/ant/org.eclipse.ant.ui/buildfiles/buildExtraJAR.xml
@@ -8,22 +8,29 @@
     https://www.eclipse.org/legal/epl-2.0/
 
     SPDX-License-Identifier: EPL-2.0
-   
+
     Contributors:
          IBM Corporation - initial API and implementation
  -->
 
 <project name="Build AntUI Ant support JAR" default="build" basedir="..">
-	
-	<target name="build" description="Cleans, builds and refreshes" depends="clean, lib/antrunnerlib.jar"/>
+
+	<target name="build" description="Builds the JAR if needed" depends="lib/antrunnerlib.jar"/>
 
 	<target name="init">
 		<property name="temp.folder" value="${basedir}/temp.folder"/>
 		<property name="build.result.folder" value="${basedir}"/>
 	</target>
 
-	<target name="lib/antrunnerlib.jar" description= "Creates the antrunner.jar" depends="init">
+	<target name="checkSourceUpToDate" depends="init">
+		<uptodate property="jarUpToDate" targetfile="${build.result.folder}/lib/antrunner.jar">
+			<srcfiles dir="${basedir}/Ant Runner Support/"  includes="**/*"/>
+		</uptodate>
+	</target>
+
+	<target name="lib/antrunnerlib.jar" description="Creates the antrunner.jar" depends="init, checkSourceUpToDate" unless="jarUpToDate">
 		<property name="destdir" value="${temp.folder}/lib/antrunner.jar.bin"/>
+		<delete dir="${temp.folder}"/>
 		<delete dir="${destdir}"/>
 		<mkdir dir="${destdir}"/>
 		<!-- copy necessary resources -->
@@ -39,4 +46,4 @@
 		<delete file="${build.result.folder}/lib/antrunner.jar"/>
 		<delete dir="${temp.folder}"/>
 	</target>
-</project>
+</project>
\ No newline at end of file
diff --git a/ant/org.eclipse.ant.ui/buildfiles/buildRemoteExtraJAR.xml b/ant/org.eclipse.ant.ui/buildfiles/buildRemoteExtraJAR.xml
index cec4e076268..e6f788bc5dd 100644
--- a/ant/org.eclipse.ant.ui/buildfiles/buildRemoteExtraJAR.xml
+++ b/ant/org.eclipse.ant.ui/buildfiles/buildRemoteExtraJAR.xml
@@ -15,7 +15,7 @@
 
 <project name="Build AntUI Remote Ant support JAR" default="build" basedir="..">
 
-	<target name="build" description="Cleans, builds and refreshes" depends="clean, lib/remoteAntLib.jar"/>
+	<target name="build" description="Cleans, builds and refreshes" depends="lib/remoteAntLib.jar"/>
 	
 	<target name="init" depends="properties">
 		<property name="temp.folder" value="${basedir}/temp.folder"/>
@@ -26,8 +26,15 @@
 		<property name="build.compiler" value="org.eclipse.jdt.core.JDTCompilerAdapter"/>
 	</target>
 	
-	<target name="lib/remoteAntLib.jar" description= "Creates the remoteAnt.jar" depends="init">
+	<target name="checkSourceUpToDate">
+		<uptodate property="jarUpToDate" targetfile="${build.result.folder}/lib/remoteAnt.jar">
+			<srcfiles dir="${basedir}/Remote Ant Support" includes="**/*"/>
+		</uptodate>
+	</target>
+	
+	<target name="lib/remoteAntLib.jar" description= "Creates the remoteAnt.jar" depends="init, checkSourceUpToDate" unless="jarUpToDate">
 		<property name="destdir" value="${temp.folder}/lib/remoteAnt.jar.bin"/>
+		<delete dir="${temp.folder}"/>
 		<delete dir="${destdir}"/>
 		<mkdir dir="${destdir}"/>
 		<javac release="17" destdir="${destdir}" failonerror="true" verbose="false" debug="on" includeAntRuntime="yes">
@@ -63,4 +70,4 @@
 	<!-- Empty target for "After a Clean" task (we don't want to rebuild the Jar here, e.g. on checkout). -->
 	<target name="after_clean"/>
 	
-</project>
+</project>
\ No newline at end of file
diff --git a/resources/bundles/org.eclipse.core.resources/META-INF/MANIFEST.MF b/resources/bundles/org.eclipse.core.resources/META-INF/MANIFEST.MF
index f089e0fbcc0..6a011fa99a9 100644
--- a/resources/bundles/org.eclipse.core.resources/META-INF/MANIFEST.MF
+++ b/resources/bundles/org.eclipse.core.resources/META-INF/MANIFEST.MF
@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.core.resources; singleton:=true
-Bundle-Version: 3.23.200.qualifier
+Bundle-Version: 3.23.300.qualifier
 Bundle-Activator: org.eclipse.core.resources.ResourcesPlugin
 Bundle-Vendor: %providerName
 Bundle-Localization: plugin
diff --git a/resources/bundles/org.eclipse.core.resources/scripts/buildExtraJAR.xml b/resources/bundles/org.eclipse.core.resources/scripts/buildExtraJAR.xml
index fb588135bf3..6539f63ef21 100644
--- a/resources/bundles/org.eclipse.core.resources/scripts/buildExtraJAR.xml
+++ b/resources/bundles/org.eclipse.core.resources/scripts/buildExtraJAR.xml
@@ -8,14 +8,14 @@
     https://www.eclipse.org/legal/epl-2.0/
 
     SPDX-License-Identifier: EPL-2.0
-   
+
     Contributors:
         IBM Corporation - initial API and implementation
  -->
 
 <project name="org.eclipse.core.resources" default="main" basedir="..">
 
-	<target name="main" depends="clean, ant_tasks/resources-ant.jar">
+	<target name="main" depends="ant_tasks/resources-ant.jar">
 	</target>
 
 	<target name="init" depends="properties">
@@ -30,8 +30,9 @@
 		<property name="build.compiler" value="org.eclipse.jdt.core.JDTCompilerAdapter"/>
 	</target>
 
-	<target name="ant_tasks/resources-ant.jar" depends="init" unless="ant_tasks/resources-ant.jar">
+	<target name="ant_tasks/resources-ant.jar" depends="init, checkSourceUpToDate" unless="jarUpToDate">
 		<property name="destdir" value="${temp.folder}/ant_tasks/resources-ant.jar.bin"/>
+		<delete dir="${temp.folder}"/>
 		<delete dir="${destdir}"/>
 		<mkdir dir="${destdir}"/>
 		<!-- copy necessary resources -->
@@ -47,4 +48,10 @@
 		<delete file="${build.result.folder}/resources-ant.jar"/>
 		<delete dir="${temp.folder}"/>
 	</target>
+
+	<target name="checkSourceUpToDate" depends="init">
+		<uptodate property="jarUpToDate" targetfile="${build.result.folder}/resources-ant.jar">
+			<srcfiles dir="${basedir}/src_ant/" includes="**/*"/>
+		</uptodate>
+	</target>
 </project>
\ No newline at end of file