Commented out precision from shaders. These examples were done on my new desk...

third_party/gles2_book/Chapter_11/Stencil_Test/Stencil_Test.c

 //
 // Book:      OpenGL(R) ES 2.0 Programming Guide
 // Authors:   Aaftab Munshi, Dan Ginsburg, Dave Shreiner
 // ISBN-10:   0321502795
 // ISBN-13:   9780321502797
 // Publisher: Addison-Wesley Professional
 // URLs:      http://safari.informit.com/9780321563835
 //            http://www.opengles-book.com
 //
 
@@ skipping 11 matching lines @@
 int stInit ( ESContext *esContext )
 {
    STUserData *userData = esContext->userData;
    GLbyte vShaderStr[] =  
       "attribute vec4 a_position;   \n"
       "void main()                  \n"
       "{                            \n"
       "   gl_Position = a_position; \n"
       "}                            \n";
    
+   // TODO(alokp): Shaders containing "precision" do not compile.
    GLbyte fShaderStr[] =  
-      "precision mediump float;  \n"
+      "//precision mediump float;  \n"
       "uniform vec4  u_color;    \n"
       "void main()               \n"
       "{                         \n"
       "  gl_FragColor = u_color; \n"
       "}                         \n";
 
    GLfloat vVertices[] = { 
        -0.75f,  0.25f,  0.50f, // Quad #0
        -0.25f,  0.25f,  0.50f,
        -0.25f,  0.75f,  0.50f,
@@ skipping 199 matching lines @@
 void stShutDown ( ESContext *esContext )
 {
    STUserData *userData = esContext->userData;
 
    // Delete program object
    glDeleteProgram ( userData->programObject );
 
    // Delete vertex buffer objects
    glDeleteBuffers ( 2, userData->vboIds );
 }