Ticket #37339: OpenCV-Portfile.2.diff

/Users/egall/Downloads/graphics/opencv/Portfile

@@ -148 +148 @@
 }
 
 variant opencl description {Enable OpenCL support.} {
+    pre-configure {
+        if {${os.platform} == "darwin" && ${os.major} < 11} {
+            ui_error "The OpenCL variant only works with OS X 10.7 Lion or later."
+            return -code error "incompatible OS X version"
+        }
+    }
     configure.args-delete       -DWITH_OPENCL=OFF
     configure.args-append       -DWITH_OPENCL=ON
 }