Bump Mapping Help

I'm trying to do some basic bump mapping, and i keep getting this error 'GL_DOT3_RGBA_EXT' : undeclared identifier Can someone please tell me what's wrong, here's my code: Another Question: What does all of glTexEnv parameters that i'm using means? i don't fully understand them, i just learned to use them by trial and error from other codes gluLookAt(0,0,4,0,0,0,0,1,0); glActiveTextureARB(GL_TEXTURE1_ARB); glBindTexture(GL_TEXTURE_2D, decalTexture); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT); glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_EXT, GL_MODULATE); glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE0_RGB_EXT, GL_PREVIOUS_EXT); glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND0_RGB_EXT, GL_SRC_ALPHA); glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE1_RGB_EXT, GL_TEXTURE); glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND1_RGB_EXT, GL_SRC_COLOR); glEnable(GL_TEXTURE_2D); if (BumpMap) { glActiveTextureARB(GL_TEXTURE0_ARB); glBindTexture(GL_TEXTURE_2D, normalMap); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT); glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_EXT, GL_DOT3_RGBA_EXT); glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE0_RGB_EXT, GL_PRIMARY_COLOR_EXT); glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND0_RGB_EXT, GL_SRC_COLOR); glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE1_RGB_EXT, GL_TEXTURE); glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND1_RGB_EXT, GL_SRC_COLOR); glEnable(GL_TEXTURE_2D); } glBegin(GL_QUADS); glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 1.0f, 1.0f); glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 0.0f); glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 1.0f, 0.0f); glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 0.0f); glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0f, 0.0f); glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 0.0f); glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0f, 1.0f); glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 0.0f); glEnd(); glActiveTextureARB(GL_TEXTURE0_ARB); glDisable(GL_TEXTURE_2D); glActiveTextureARB(GL_TEXTURE1_ARB); glDisable(GL_TEXTURE_2D);