diff --git a/include/osg/Texture b/include/osg/Texture
index cc6a83e8f..afda0228c 100644
--- a/include/osg/Texture
+++ b/include/osg/Texture
@@ -54,6 +54,25 @@
 #define GL_COMPRESSED_RGBA_S3TC_DXT5_EXT        0x83F3
 #endif
 
+#ifndef GL_ARB_INTERNAL_TEXTURE_FORMAT
+#define GL_RGBA32F_ARB                           0x8814
+#define GL_RGB32F_ARB                            0x8815
+#define GL_ALPHA32F_ARB                          0x8816
+#define GL_INTENSITY32F_ARB                      0x8817
+#define GL_LUMINANCE32F_ARB                      0x8818
+#define GL_LUMINANCE_ALPHA32F_ARB                0x8819
+#define GL_RGBA16F_ARB                           0x881A
+#define GL_RGB16F_ARB                            0x881B
+#define GL_ALPHA16F_ARB                          0x881C
+#define GL_INTENSITY16F_ARB                      0x881D
+#define GL_LUMINANCE16F_ARB                      0x881E
+#define GL_LUMINANCE_ALPHA16F_ARB                0x881F
+#endif
+
+#ifndef GL_ARB_PIXEL_DATA
+#define GL_HALF_FLOAT_ARB                        0x140B
+#endif
+
 #ifndef GL_NV_texture_shader
 #define GL_HILO_NV                              0x86F4
 #define GL_DSDT_NV                              0x86F5