BUG: fix opengl find_package for windows

Modules/ThirdParty/OpenGL/CMakeLists.txt

@@ -2,6 +2,6 @@ project(OTBOpenGL)
 set(OTBOpenGL_THIRD_PARTY 1)
 
 set(OTBOpenGL_SYSTEM_INCLUDE_DIRS ${OPENGL_INCLUDE_DIR})
-set(OTBOpenGL_LIBRARIES ${OPENGL_LIBRARY})
+set(OTBOpenGL_LIBRARIES ${OPENGL_LIBRARIES})
 
 otb_module_impl()

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

@@ -46,15 +46,16 @@ else(APPLE)
   mark_as_advanced(OPENGL_LIBRARIES)
 endif(APPLE)
 
-
-if(NOT OPENGL_INCLUDE_DIR)
-  message(FATAL_ERROR "Could not find OpenGL (missing: OPENGL_INCLUDE_DIR")
-endif()
-
-if(NOT OPENGL_gl_LIBRARY)
-  message(FATAL_ERROR "Could not find OpenGL (missing: OPENGL_gl_LIBRARY")
-endif()
-
-if(NOT OPENGL_glu_LIBRARY)
-  message(FATAL_ERROR "Could not find OpenGL (missing: OPENGL_glu_LIBRARY")
+if(NOT WIN32)
+  if(NOT OPENGL_INCLUDE_DIR)
+    message(FATAL_ERROR "Could not find OpenGL (missing: OPENGL_INCLUDE_DIR")
+  endif()
+  
+  if(NOT OPENGL_gl_LIBRARY)
+    message(FATAL_ERROR "Could not find OpenGL (missing: OPENGL_gl_LIBRARY")
+  endif()
+  
+  if(NOT OPENGL_glu_LIBRARY)
+    message(FATAL_ERROR "Could not find OpenGL (missing: OPENGL_glu_LIBRARY")
+  endif()
 endif()