add-math.h.patch

diff --git a/examples/opencl/histogram.cpp b/examples/opencl/histogram.cpp
index 4817efd..fb3c39b 100644
--- a/examples/opencl/histogram.cpp
+++ b/examples/opencl/histogram.cpp
@@ -18,6 +18,7 @@
 #include <iterator>
 #include <algorithm>
 #include "cl_helpers.h"
+#include <math.h>
 
 using namespace cl;
 using namespace std;

clone and build

tmp‣ git clone https://github.com/arrayfire/forge && cd forge && cmake . -DBUILD_EXAMPLES=ON && make
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run opencl example

forge (master)‣ examples/opencl/surface_opencl
InfoLog:
WARNING: Output of vertex shader 'hpoint' not read by fragment shader

OpenGL Shader linking failed(2001)