Fixed gyp file to use :state_feedback_loop
diff --git a/frc971/control_loops/control_loops.gyp b/frc971/control_loops/control_loops.gyp
index 7a8c8f1..dc380e6 100644
--- a/frc971/control_loops/control_loops.gyp
+++ b/frc971/control_loops/control_loops.gyp
@@ -50,7 +50,7 @@
         'control_loops',
         '<(AOS)/common/common.gyp:controls',
         '<(DEPTH)/frc971/frc971.gyp:common',
-        '<(EXTERNALS):eigen',
+        'state_feedback_loop',
       ],
     },
     {
@@ -66,7 +66,7 @@
         'control_loops',
         'index_lib',
         '<(AOS)/common/common.gyp:queue_testutils',
-        '<(EXTERNALS):eigen',
+        'state_feedback_loop',
       ],
     },
     {