Ubuntu :: Java IDE JGrasp Not Executable

I'm trying to run the java IDE jgrasp and getting an error. I installed the java jdk from sun and verified with java -version. At first running the jgrasp executable I had to go to src dir and the readme said to sudo apt-get install libxt-dev and then ./configure and ./Make.sh. And then I ran the executable which gave me the error below.

java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) Server VM (build 21.0-b17, mixed mode)
java.lang.UnsatisfiedLinkError: /usr/lib/jvm/jdk1.7.0/jre/lib/i386/xawt/libmawt.so: libXext.so.6: cannot open shared object file: No such file or directory
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.jav a:192
at java.lang.ClassLoader.loadLibrary(ClassLoader.java :1825)
at java.lang.Runtime.load0(Runtime.java:792)
at java.lang.System.load(System.java:1059)
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.jav a:192
at java.lang.ClassLoader.loadLibrary(ClassLoader.java :1846)
at java.lang.Runtime.loadLibrary0(Runtime.java:845)
at java.lang.System.loadLibrary(System.java:1084)
at sun.security.action.LoadLibraryAction.run(LoadLibr aryAction.java:67)
at sun.security.action.LoadLibraryAction.run(LoadLibr aryAction.java:47)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Toolkit.loadLibraries(Toolkit.java:164
at java.awt.Toolkit.<clinit>(Toolkit.java:1670)
at java.awt.EventQueue.invokeLater(EventQueue.java:11 92)
at javax.swing.SwingUtilities.invokeLater(SwingUtilit ies.java:1287)
at Grasp.a(Grasp.java:
at Grasp.main(Grasp.java:123)