Index: src/main/java/hudson/plugins/qmake/QmakeBuilder.java
===================================================================
--- src/main/java/hudson/plugins/qmake/QmakeBuilder.java	(revision 23777)
+++ src/main/java/hudson/plugins/qmake/QmakeBuilder.java	(working copy)
@@ -36,10 +36,10 @@
     private QmakeBuilderImpl builderImpl;
     
     @DataBoundConstructor
-    public QmakeBuilder(String projectFile, String extraArguments) {
+    public QmakeBuilder(String projectFile, String extraArguments, Boolean cleanBuild) {
       this.projectFile = projectFile;
       this.extraArguments = extraArguments;
-      this.cleanBuild = false;
+      this.cleanBuild = cleanBuild;
       builderImpl = new QmakeBuilderImpl();		
     }
 
@@ -94,7 +94,16 @@
 
 	String makeExe = "make";
 	if (!launcher.isUnix()) makeExe = "nmake";
+	
+	// launch make clean
+	if (getCleanBuild()) {
+		result = launcher.launch().cmds(makeExe, "clean").envs(envVars).stdout(logger).pwd(workDir).join();
+		if (result != 0) {
+		  return false;
+		}
+	}
 
+	// launch make
 	result = launcher.launch().cmds(makeExe).envs(envVars).stdout(logger).pwd(workDir).join();
 
 	if (result != 0) {
Index: src/main/resources/hudson/plugins/qmake/QmakeBuilder/config.jelly
===================================================================
--- src/main/resources/hudson/plugins/qmake/QmakeBuilder/config.jelly	(revision 23777)
+++ src/main/resources/hudson/plugins/qmake/QmakeBuilder/config.jelly	(working copy)
@@ -7,5 +7,9 @@
   <f:entry title="Extra arguments to qmake (optional)" field="extraArguments">
     	<f:textbox  />
   </f:entry>
+  
+  <f:entry title="Clean first" field="cleanBuild">
+    	<f:checkbox default="false"  />
+  </f:entry>
 	
 </j:jelly>