diff --git a/include/osg/GLExtensions b/include/osg/GLExtensions
index 65e8eb697..39bf312d0 100644
--- a/include/osg/GLExtensions
+++ b/include/osg/GLExtensions
@@ -571,6 +571,13 @@ class OSG_EXPORT GLExtensions : public osg::Referenced
         void (GL_APIENTRY * glBlitFramebuffer) (GLint, GLint, GLint, GLint, GLint, GLint, GLint, GLint, GLbitfield, GLenum);
         void (GL_APIENTRY * glGetRenderbufferParameteriv) (GLenum, GLenum, GLint*);
 
+        //subroutine
+        GLint(GL_APIENTRY* glGetSubroutineUniformLocation)( GLuint program, GLenum shadertype, const GLchar *name);
+        void (GL_APIENTRY * glGetActiveSubroutineUniformName)( GLuint program,    GLenum shadertype, GLuint index, GLsizei bufsize, GLsizei *length, GLchar *name);
+        void (GL_APIENTRY * glGetActiveSubroutineUniformiv)( GLuint program, GLenum shadertype, GLuint index, GLenum pname, GLint *values);
+        GLuint (GL_APIENTRY *  glGetSubroutineIndex)( GLuint program, GLenum shadertype, const GLchar *name);
+        void (GL_APIENTRY * glGetActiveSubroutineName)( GLuint program,    GLenum shadertype, GLuint index, GLsizei bufsize, GLsizei *length, GLchar *name);
+        void (GL_APIENTRY * glGetProgramStageiv)( GLuint program,    GLenum shadertype, GLenum pname, GLint *values);
 
         // Sync
         GLsync (GL_APIENTRY * glFenceSync) (GLenum condition, GLbitfield flags);
diff --git a/src/osg/GLExtensions.cpp b/src/osg/GLExtensions.cpp
index 1114d6d13..f5e44fc00 100644
--- a/src/osg/GLExtensions.cpp
+++ b/src/osg/GLExtensions.cpp
@@ -1040,6 +1040,13 @@ GLExtensions::GLExtensions(unsigned int contextID)
         (isGLExtensionSupported(contextID, "GL_EXT_packed_depth_stencil")) ||
         (isGLExtensionSupported(contextID, "GL_OES_packed_depth_stencil"));
 
+    //subroutine
+    osg::setGLExtensionFuncPtr(glGetSubroutineUniformLocation, "glGetSubroutineUniformLocation");
+    osg::setGLExtensionFuncPtr(glGetActiveSubroutineUniformName, "glGetActiveSubroutineUniformName");
+    osg::setGLExtensionFuncPtr(glGetActiveSubroutineUniformiv, "glGetActiveSubroutineUniformiv");
+    osg::setGLExtensionFuncPtr(glGetSubroutineIndex, "glGetSubroutineIndex");
+    osg::setGLExtensionFuncPtr(glGetActiveSubroutineName, "glGetActiveSubroutineName");
+    osg::setGLExtensionFuncPtr(glGetProgramStageiv, "glGetProgramStageiv");
 
     // Sync
     osg::setGLExtensionFuncPtr(glFenceSync, "glFenceSync");