Check if searching OGRE dir with version suffix failed. I'm not sure if this is the right way to do it though.

cmake/FindOGRE.cmake

@@ -408,15 +408,19 @@ macro(ogre_find_plugin PLUGIN HEADER)
   # Search for release plugins in OGRE dir with version suffix
   find_library(OGRE_${PLUGIN}_LIBRARY_REL NAMES ${OGRE_${PLUGIN}_LIBRARY_NAMES}
     HINTS ${OGRE_LIBRARY_DIRS} PATH_SUFFIXES "" OGRE-${OGRE_VERSION} opt release release/opt relwithdebinfo relwithdebinfo/opt minsizerel minsizerel/opt)
-  # Search for release plugins in OGRE dir without version suffix
-  find_library(OGRE_${PLUGIN}_LIBRARY_REL NAMES ${OGRE_${PLUGIN}_LIBRARY_NAMES}
-    HINTS ${OGRE_LIBRARY_DIRS} PATH_SUFFIXES "" OGRE opt release release/opt relwithdebinfo relwithdebinfo/opt minsizerel minsizerel/opt)
+  if(NOT EXISTS "${OGRE_${PLUGIN}_LIBRARY_REL}")
+    # Search for release plugins in OGRE dir without version suffix
+    find_library(OGRE_${PLUGIN}_LIBRARY_REL NAMES ${OGRE_${PLUGIN}_LIBRARY_NAMES}
+      HINTS ${OGRE_LIBRARY_DIRS} PATH_SUFFIXES "" OGRE opt release release/opt relwithdebinfo relwithdebinfo/opt minsizerel minsizerel/opt)
+  endif()
   # Search for debug plugins in OGRE dir with version suffix
   find_library(OGRE_${PLUGIN}_LIBRARY_DBG NAMES ${OGRE_${PLUGIN}_LIBRARY_NAMES_DBG}
     HINTS ${OGRE_LIBRARY_DIRS} PATH_SUFFIXES "" OGRE-${OGRE_VERSION} opt debug debug/opt)
-  # Search for debug plugins in OGRE dir without version suffix
-  find_library(OGRE_${PLUGIN}_LIBRARY_DBG NAMES ${OGRE_${PLUGIN}_LIBRARY_NAMES_DBG}
-    HINTS ${OGRE_LIBRARY_DIRS} PATH_SUFFIXES "" OGRE opt debug debug/opt)
+  if(NOT EXISTS "${OGRE_${PLUGIN}_LIBRARY_DBG}")
+    # Search for debug plugins in OGRE dir without version suffix
+    find_library(OGRE_${PLUGIN}_LIBRARY_DBG NAMES ${OGRE_${PLUGIN}_LIBRARY_NAMES_DBG}
+      HINTS ${OGRE_LIBRARY_DIRS} PATH_SUFFIXES "" OGRE opt debug debug/opt)
+  endif()
   make_library_set(OGRE_${PLUGIN}_LIBRARY)
 
   if (OGRE_${PLUGIN}_LIBRARY OR OGRE_${PLUGIN}_INCLUDE_DIR)