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--- a/CMakeLists.txt	2011-08-09 16:41:03.073611709 -0400
+++ b/CMakeLists.txt	2011-08-09 16:41:22.943844346 -0400
@@ -1221,7 +1221,7 @@
 	ENDFOREACH()
 	FOREACH(path_label ${PATH_LABELS})
 		SET(CURRENT_LABEL ${${path_label}_LABEL})
-		STRING(LENGTH ${CURRENT_LABEL} CURRENT_LENGTH)
+		STRING(LENGTH "${CURRENT_LABEL}" CURRENT_LENGTH)
 		WHILE(${PATH_LABEL_LENGTH} GREATER ${CURRENT_LENGTH})
 			SET(CURRENT_LABEL " ${CURRENT_LABEL}")
 			STRING(LENGTH "${CURRENT_LABEL}" CURRENT_LENGTH)