PKG: mantis 1193. exception for OpenGL on osx

Modules/ThirdParty/OpenGL/otb-module-init.cmake

-find_package(OpenGL REQUIRED)
+#detection of OpenGL is apply is bit tricy as we deactivate
+#framework on OSX globally. see mantis #1193
+if(APPLE)
+  set(OPENGL_FOUND FALSE)
+  find_library(OPENGL_gl_LIBRARY OpenGL DOC "OpenGL lib for OSX")
+  find_library(OPENGL_glu_LIBRARY AGL DOC "AGL lib for OSX")
+  find_path(OPENGL_INCLUDE_DIR OpenGL/gl.h DOC "Include for OpenGL on OSX")
+  if(OPENGL_gl_LIBRARY)
+    set( OPENGL_LIBRARIES  ${OPENGL_gl_LIBRARY} ${OPENGL_LIBRARIES})
+    if(OPENGL_glu_LIBRARY)
+      set( OPENGL_GLU_FOUND "YES" )
+      set( OPENGL_LIBRARIES ${OPENGL_glu_LIBRARY} ${OPENGL_LIBRARIES} )
+    else()
+      set( OPENGL_GLU_FOUND "NO" )
+    endif()
+    # This deprecated setting is for backward compatibility with CMake1.4
+    set (OPENGL_LIBRARY ${OPENGL_LIBRARIES})
+  endif()
 
-mark_as_advanced(OPENGL_INCLUDE_DIR)
-mark_as_advanced(OPENGL_LIBRARY)
+  # This deprecated setting is for backward compatibility with CMake1.4
+  set(OPENGL_INCLUDE_PATH ${OPENGL_INCLUDE_DIR})
+  mark_as_advanced(
+    OPENGL_INCLUDE_DIR
+    OPENGL_LIBRARY
+    OPENGL_glu_LIBRARY
+    OPENGL_gl_LIBRARY
+    )
+  if(NOT OPENGL_LIBRARY OR NOT OPENGL_INCLUDE_DIR)
+    message(FATAL_ERROR "Cannot find OpenGL. Set OPENGL_INCLUDE_DIR and OPENGL_LIBRARY")
+  endif()
 
-if(NOT OPENGL_FOUND)
- message(FATAL_ERROR "Cannot find OpenGL. Set OPENGL_INCLUDE_DIR and OPENGL_LIBRARY")
-endif()
+  set(OPENGL_FOUND TRUE)
+else(APPLE)
+  find_package(OpenGL REQUIRED)
+  mark_as_advanced(OPENGL_INCLUDE_DIR)
+  mark_as_advanced(OPENGL_LIBRARY)
+  if(NOT OPENGL_FOUND)
+    message(FATAL_ERROR "Cannot find OpenGL. Set OPENGL_INCLUDE_DIR and OPENGL_LIBRARY")
+  endif()
+endif(APPLE)