java - The import edu cannot be resolved -

i using eclipse indigo service release 2. created project, projectname, , added package, packagename. tried adde source file following code package.

package packagename;  import edu.emory.mathcs.jtransforms.fft.doublefft_1d;  public class classname {  }

i error message

the import edu cannot resolved

i dont use indigo, in eclipse these steps.

right click project , click properties.

click java build path tab.

add jars or add external jars (whichever is), find jar , add.

in java build path can add classes , few other things.

Detect