When FLAT or SMOOTH shading is enabled, there are no any shading performed if lighting is enabled via 
glEnable(GL_LIGHTING). Looks like QNX's OpenGL ES implementation have wrong initial values for materials. GL ES specs 
says:
GL_AMBIENT must be set to (0.2, 0.2, 0.2, 1.0).
GL DIFFUSE must be set to (0.8, 0.8, 0.8, 1.0).
GL_SPECULAR must be set to (0, 0, 0, 1).
GL EMISSION must be set to (0, 0, 0, 1).
GL SHININESS must be set to 0.

Or if no any of material parameters are set QNX's OpenGL ES implementation switches off materials or they are not used 
in the lighting equation if they are not set.