move to own git serverHEADmaster

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diff --git a/vcpkg/ports/opengl/usage b/vcpkg/ports/opengl/usage
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+The package opengl is compatible with built-in CMake targets via CMake v3.7 and prior syntax
+
+    find_package(OpenGL REQUIRED)
+    target_link_libraries(main PRIVATE ${OPENGL_LIBRARIES})
+    target_include_directories(main PRIVATE ${OPENGL_INCLUDE_DIR})
+
+and the CMake v3.8 and beyond imported target syntax
+
+    find_package(OpenGL REQUIRED)
+    target_link_libraries(main PRIVATE OpenGL::GL)
+
+introduction of various components
+
+    find_package(OpenGL REQUIRED COMPONENTS GL      # v3.8
+                                            GLU     # v3.8
+                                            GLX     # v3.10
+                                            EGL     # v3.10
+                                            OpenGL) # v3.10
+
+The OpenGL SDK is highly platform dependent and is usually an OS component. It's not realistic to build from source for every platform.
+
+    WINDOWS: is part of the Windows SDK which this package installs.
+    LINUX: the SDK may be installed from your distro's repo or from 3rd parties manually. There are too many to count.
+    APPLE: consult your distribution vendor on the state of OpenGL support: https://support.apple.com/en-us/HT202823