diff --git a/include/osg/GL2Extensions b/include/osg/GL2Extensions
index 38793aa1a..b4223a326 100644
--- a/include/osg/GL2Extensions
+++ b/include/osg/GL2Extensions
@@ -485,6 +485,46 @@ typedef char GLchar;
 #define GL_TEXTURE_CUBE_MAP_SEAMLESS      0x884F
 #endif
 
+#ifndef GL_VERSION_4_3
+#define GL_SHADER_STORAGE_BARRIER_BIT 0x2000
+#define GL_MAX_COMBINED_SHADER_OUTPUT_RESOURCES 0x8F39
+#define GL_SHADER_STORAGE_BUFFER 0x90D2
+#define GL_SHADER_STORAGE_BUFFER_BINDING 0x90D3
+#define GL_SHADER_STORAGE_BUFFER_START 0x90D4
+#define GL_SHADER_STORAGE_BUFFER_SIZE 0x90D5
+#define GL_MAX_VERTEX_SHADER_STORAGE_BLOCKS 0x90D6
+#define GL_MAX_GEOMETRY_SHADER_STORAGE_BLOCKS 0x90D7
+#define GL_MAX_TESS_CONTROL_SHADER_STORAGE_BLOCKS 0x90D8
+#define GL_MAX_TESS_EVALUATION_SHADER_STORAGE_BLOCKS 0x90D9
+#define GL_MAX_FRAGMENT_SHADER_STORAGE_BLOCKS 0x90DA
+#define GL_MAX_COMPUTE_SHADER_STORAGE_BLOCKS 0x90DB
+#define GL_MAX_COMBINED_SHADER_STORAGE_BLOCKS 0x90DC
+#define GL_MAX_SHADER_STORAGE_BUFFER_BINDINGS 0x90DD
+#define GL_MAX_SHADER_STORAGE_BLOCK_SIZE 0x90DE
+#define GL_SHADER_STORAGE_BUFFER_OFFSET_ALIGNMENT 0x90DF
+
+
+#define GL_VERTEX_ATTRIB_ARRAY_BARRIER_BIT 0x00000001
+#define GL_ELEMENT_ARRAY_BARRIER_BIT 0x00000002
+#define GL_UNIFORM_BARRIER_BIT 0x00000004
+#define GL_TEXTURE_FETCH_BARRIER_BIT 0x00000008
+#define GL_SHADER_IMAGE_ACCESS_BARRIER_BIT 0x00000020
+#define GL_COMMAND_BARRIER_BIT 0x00000040
+#define GL_PIXEL_BUFFER_BARRIER_BIT 0x00000080
+#define GL_TEXTURE_UPDATE_BARRIER_BIT 0x00000100
+#define GL_BUFFER_UPDATE_BARRIER_BIT 0x00000200
+#define GL_FRAMEBUFFER_BARRIER_BIT 0x00000400
+#define GL_TRANSFORM_FEEDBACK_BARRIER_BIT 0x00000800
+#define GL_ATOMIC_COUNTER_BARRIER_BIT 0x00001000
+
+#define GL_MAP_READ_BIT 0x0001
+#define GL_MAP_WRITE_BIT 0x0002
+#define GL_MAP_INVALIDATE_RANGE_BIT 0x0004
+#define GL_MAP_INVALIDATE_BUFFER_BIT 0x0008
+#define GL_MAP_FLUSH_EXPLICIT_BIT 0x0010
+#define GL_MAP_UNSYNCHRONIZED_BIT 0x0020
+#endif
+
 namespace osg {
 
 class OSG_EXPORT GL2Extensions : public osg::Referenced
@@ -679,6 +719,10 @@ class OSG_EXPORT GL2Extensions : public osg::Referenced
         void (GL_APIENTRY * glGetActiveAtomicCounterBufferiv)( GLuint program, GLuint bufferIndex, GLenum pname, GLint* params );
         void (GL_APIENTRY * glDispatchCompute)( GLuint numGroupsX, GLuint numGroupsY, GLuint numGroupsZ );
 
+        void (GL_APIENTRY * glMemoryBarrier)( GLbitfield barriers );
+
+        GLvoid* (GL_APIENTRY * glMapBufferRange)(GLenum target,  GLintptr offset,  GLsizeiptr length,  GLbitfield access);
+        void (GL_APIENTRY * glBindBufferBase)(GLenum target,  GLuint index,  GLuint buffer);
 };
 
 }
diff --git a/src/osg/GL2Extensions.cpp b/src/osg/GL2Extensions.cpp
index abbe9b5b2..8259ce760 100644
--- a/src/osg/GL2Extensions.cpp
+++ b/src/osg/GL2Extensions.cpp
@@ -272,6 +272,9 @@ GL2Extensions::GL2Extensions(unsigned int contextID)
     // ARB_compute_shader
     setGLExtensionFuncPtr(glDispatchCompute,  "glDispatchCompute" );
 
+    setGLExtensionFuncPtr(glMemoryBarrier,  "glMemoryBarrier", "glMemoryBarrierEXT" );
+    setGLExtensionFuncPtr(glMapBufferRange,  "glMapBufferRange" );
+    setGLExtensionFuncPtr(glBindBufferBase,  "glBindBufferBase", "glBindBufferBaseEXT", "glBindBufferBaseNV" );
 
 }