diff -Nur boost_1_66_0/boost/optional/detail/old_optional_implementation.hpp boost_1_66_0.patched/boost/optional/detail/old_optional_implementation.hpp
--- boost_1_66_0/boost/optional/detail/old_optional_implementation.hpp	2017-12-14 00:56:46.000000000 +0100
+++ boost_1_66_0.patched/boost/optional/detail/old_optional_implementation.hpp	2018-01-30 15:16:34.164565759 +0100
@@ -147,7 +147,7 @@
     }
 #endif
 
-    // Creates an optional<T> initialized with 'val' IFF cond is true, otherwise creates an uninitialzed optional<T>.
+    // Creates an optional<T> initialized with 'val' IFF cond is true, otherwise creates an uninitialized optional<T>.
     // Can throw if T::T(T const&) does
     optional_base ( bool cond, argument_type val )
       :
diff -Nur boost_1_66_0/boost/optional/optional.hpp boost_1_66_0.patched/boost/optional/optional.hpp
--- boost_1_66_0/boost/optional/optional.hpp	2017-12-14 00:56:46.000000000 +0100
+++ boost_1_66_0.patched/boost/optional/optional.hpp	2018-01-30 15:16:34.165565744 +0100
@@ -149,7 +149,7 @@
     }
 #endif
 
-    // Creates an optional<T> initialized with 'val' IFF cond is true, otherwise creates an uninitialzed optional<T>.
+    // Creates an optional<T> initialized with 'val' IFF cond is true, otherwise creates an uninitialized optional<T>.
     // Can throw if T::T(T const&) does
     optional_base ( bool cond, argument_type val )
       :
@@ -160,7 +160,7 @@
     }
 
 #ifndef  BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
-    // Creates an optional<T> initialized with 'move(val)' IFF cond is true, otherwise creates an uninitialzed optional<T>.
+    // Creates an optional<T> initialized with 'move(val)' IFF cond is true, otherwise creates an uninitialized optional<T>.
     // Can throw if T::T(T &&) does
     optional_base ( bool cond, rval_reference_type val )
       :
diff -Nur boost_1_66_0/boost/regex/v4/match_results.hpp boost_1_66_0.patched/boost/regex/v4/match_results.hpp
--- boost_1_66_0/boost/regex/v4/match_results.hpp	2017-12-14 00:56:48.000000000 +0100
+++ boost_1_66_0.patched/boost/regex/v4/match_results.hpp	2018-01-30 15:16:34.165565744 +0100
@@ -563,7 +563,7 @@
    //
    static void raise_logic_error()
    {
-      std::logic_error e("Attempt to access an uninitialzed boost::match_results<> class.");
+      std::logic_error e("Attempt to access an uninitialized boost::match_results<> class.");
       boost::throw_exception(e);
    }