Bug 39720 Adding external jar to the Build Path of an existing Java project [build path]
When adding an external jar file to an existing Java project, the "Setting Build Path" error dialog is displayed. The dialog displays the text "An error occured while setting the build path. Reason: /usr does not exist". The jar to be added in this case is located in the /usr/local/bin/ directory. I am working with the release 2.1 build for linux.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/CPListElement.java
*/
	public void setIsMissing(boolean isMissing) {
		fIsMissing= isMissing;
	}
	/**
	 * Returns if a entry is exported (only applies to libraries)
	 * @return Returns a boolean
	 */
	public boolean isExported() {
		return fIsExported;
	}
	/**
	 * Sets the export state of the entry.
	 */
	public void setExported(boolean isExported) {
		if (isExported != fIsExported) {
			fIsExported = isExported;
			
			attributeChanged(null);
		}
	}
	/**
	 * Gets the project.
	 * @return Returns a IJavaProject
	 */
	public IJavaProject getJavaProject() {
		return fProject;
	}
	
	public static CPListElement createFromExisting(IClasspathEntry curr, IJavaProject project) {