### Eclipse Workspace Patch 1.0
#P org.eclipse.pde.core
Index: src/org/eclipse/pde/internal/core/builders/ManifestConsistencyChecker.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.pde.core/src/org/eclipse/pde/internal/core/builders/ManifestConsistencyChecker.java,v
retrieving revision 1.20
diff -u -r1.20 ManifestConsistencyChecker.java
--- src/org/eclipse/pde/internal/core/builders/ManifestConsistencyChecker.java	2 Jan 2008 15:56:21 -0000	1.20
+++ src/org/eclipse/pde/internal/core/builders/ManifestConsistencyChecker.java	6 May 2008 20:19:28 -0000
@@ -252,9 +252,7 @@
 					validateManifestFile(manifestFile, new SubProgressMonitor(monitor, 1));
 			}
 		}
-		if ((type & BUILD) != 0) {
-			validateBuildProperties(new SubProgressMonitor(monitor, 1));
-		}
+		validateBuildProperties(new SubProgressMonitor(monitor, 1), (type & BUILD) != 0);
 	}
 
 	private int getWorkAmount(int type) {
@@ -330,12 +328,22 @@
 		monitor.done();
 	}
 
-	private void validateBuildProperties(IProgressMonitor monitor) {
+	private void validateBuildProperties(IProgressMonitor monitor, boolean force) {
 		if (monitor.isCanceled())
 			return;
 		IProject project = getProject();
 		IFile file = project.getFile(ICoreConstants.BUILD_FILENAME_DESCRIPTOR);
 		if (file.exists()) {
+			// If we aren't strictly required to check the build.properties, 
+			// check them anyway if there are currently PDE markers
+			//
+			if (!force) {
+				try {
+					if (file.findMarkers(PDEMarkerFactory.MARKER_ID, false, 0).length == 0)
+						return;
+				} catch (CoreException e) {
+				}
+			}
 			monitor.subTask(PDECoreMessages.ManifestConsistencyChecker_buildPropertiesSubtask);
 			BuildErrorReporter ber = new BuildErrorReporter(file);
 			ber.validateContent(monitor);