Unity application crashes on iOS due to shader not compiled

I am trying to build my Unity 5.4.2f2 application for iOS. It is done with no compile errors. But when I try to run the application using Xcode 8.0, it immediately crashes and the debugger reports the following error. ``` Initialize engine version: 5.4.2f2 (b7e030c65c9b) -------- Shader compilation failed #version 100 #extension GL_EXT_frag_depth : enable precision highp float; uniform highp vec4 _ProjectionParams; uniform highp vec4 _ZBufferParams; uniform highp mat4 unity_CameraToWorld; uniform highp mat4 _NonJitteredVP; uniform highp mat4 _PreviousVP; uniform highp sampler2D _CameraDepthTexture; varying highp vec2 xlv_TEXCOORD0; varying highp vec3 xlv_TEXCOORD1; void main () { highp vec4 tmpvar_1; tmpvar_1 = texture2D (_CameraDepthTexture, xlv_TEXCOORD0); mediump vec2 tmpvar_2; highp vec4 tmpvar_3; tmpvar_3.w = 1.0; tmpvar_3.xyz = ((xlv_TEXCOORD1 * (_ProjectionParams.z / xlv_TEXCOORD1.z)) * (1.0/(( (_ZBufferParams.x * tmpvar_1.x) + _ZBufferParams.y)))); highp vec4 tmpvar_4; tmpvar_4 = (unity_CameraToWorld * tmpvar_3); highp vec4 tmpvar_5; tmpvar_5 = (_PreviousVP * tmpvar_4); highp vec4 tmpvar_6; tmpvar_6 = (_NonJitteredVP * tmpvar_4); highp vec2 tmpvar_7; tmpvar_7 = (((tmpvar_5.xy / tmpvar_5.w) + 1.0) / 2.0); highp vec2 tmpvar_8; tmpvar_8 = (((tmpvar_6.xy / tmpvar_6.w) + 1.0) / 2.0); tmpvar_2 = (tmpvar_8 - tmpvar_7); mediump vec4 tmpvar_9; tmpvar_9.zw = vec2(0.0, 1.0); tmpvar_9.xy = tmpvar_2; gl_FragDepthEXT = tmpvar_1.x; gl_FragData[0] = tmpvar_9; } ``` failed compiling: fragment evaluation shader WARNING: 0:4: extension 'GL_EXT_frag_depth' is not supported ERROR: 0:38: Use of undeclared identifier 'gl_FragDepthEXT' Note: Creation of internal variant of shader 'Hidden/Internal-MotionVectors' failed. WARNING: Shader Unsupported: 'Hidden/Internal-MotionVectors' - Pass '' has no vertex shader WARNING: Shader Unsupported: 'Hidden/Internal-MotionVectors' - Setting to default shader. Xcode 8.0 contains `OPenGL 2.0`. At the Unity forum people tell us that it should be fine for Unity 5.4. But it's not working for me. On Android devices my application runs quite OK.