Merge pull request #279 from scopatz/cycroot

updated for CYCLUS_ROOT_DIR

Author: gidden

cmake/FindCyclus.cmake

@@ -16,14 +16,16 @@ IF(DEFINED ENV{CYCLUS_ROOT_DIR})
         MESSAGE(STATUS "\t\tThe environment variable CYCLUS_ROOT_DIR: $ENV{CYCLUS_ROOT_DIR}")
     ENDIF(NOT DEFINED CYCLUS_ROOT_DIR)
 ELSE(DEFINED ENV{CYCLUS_ROOT_DIR})
-    FIND_PROGRAM(CYCLUS_BIN cyclus)
-    IF(CYCLUS_BIN)
-        EXECUTE_PROCESS(COMMAND cyclus --install-path
-            OUTPUT_VARIABLE CYCLUS_ROOT_DIR
-            OUTPUT_STRIP_TRAILING_WHITESPACE)
-    ELSE(CYCLUS_BIN)
-        SET(CYCLUS_ROOT_DIR "$ENV{HOME}/.local")
-    ENDIF(CYCLUS_BIN)
+    IF(NOT DEFINED CYCLUS_ROOT_DIR)
+        FIND_PROGRAM(CYCLUS_BIN cyclus)
+        IF(CYCLUS_BIN)
+            EXECUTE_PROCESS(COMMAND cyclus --install-path
+                OUTPUT_VARIABLE CYCLUS_ROOT_DIR
+                OUTPUT_STRIP_TRAILING_WHITESPACE)
+        ELSE(CYCLUS_BIN)
+            SET(CYCLUS_ROOT_DIR "$ENV{HOME}/.local")
+        ENDIF(CYCLUS_BIN)
+    ENDIF(NOT DEFINED CYCLUS_ROOT_DIR)
 ENDIF(DEFINED ENV{CYCLUS_ROOT_DIR})
 
 # Let the user know if we're using a hint