Serialization v3

Author: dellaert

gtsam/geometry/SL4.h

@@ -13,7 +13,7 @@
 #include <gtsam/config.h>
 #include <gtsam/dllexport.h>
 
-#ifdef GTSAM_ENABLE_BOOST_SERIALIZATION
+#if GTSAM_ENABLE_BOOST_SERIALIZATION
 #include <gtsam/base/MatrixSerialization.h>
 #endif
 
@@ -108,7 +108,7 @@ class GTSAM_EXPORT SL4 : public MatrixLieGroup<SL4, 15, 4> {
   /// @}
 
  private:
-#ifdef GTSAM_ENABLE_BOOST_SERIALIZATION
+#if GTSAM_ENABLE_BOOST_SERIALIZATION
   /// Serialization function
   friend class boost::serialization::access;
   template <class Archive>