diff --git a/CMakeLists.txt b/CMakeLists.txt
index f2a921f..7ba7193 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -89,6 +89,7 @@ if(BUILD_SHARED_LIBS)
 else()
     target_compile_definitions(boost_buffers PUBLIC BOOST_BUFFERS_STATIC_LINK=1)
 endif()
+target_compile_definitions(boost_buffers PRIVATE BOOST_BUFFERS_SOURCE)
 
 if(BOOST_BUFFERS_INSTALL AND NOT BOOST_SUPERPROJECT_VERSION)
     install(TARGETS boost_buffers
diff --git a/include/boost/buffers/any_dynamic_buffer.hpp b/include/boost/buffers/any_dynamic_buffer.hpp
index db77b4e..6c5125b 100644
--- a/include/boost/buffers/any_dynamic_buffer.hpp
+++ b/include/boost/buffers/any_dynamic_buffer.hpp
@@ -22,7 +22,8 @@ namespace buffers {
 
 /** An abstract, type-erased dynamic buffer.
 */
-struct any_dynamic_buffer
+struct BOOST_SYMBOL_VISIBLE
+    any_dynamic_buffer
 {
     using const_buffers_type =
         buffers::const_buffer_span;
diff --git a/include/boost/buffers/circular_buffer.hpp b/include/boost/buffers/circular_buffer.hpp
index a7ca891..1b301c6 100644
--- a/include/boost/buffers/circular_buffer.hpp
+++ b/include/boost/buffers/circular_buffer.hpp
@@ -25,7 +25,8 @@ namespace buffers {
     @ref prepare and @ref data always have
     length two.
 */
-class circular_buffer
+class BOOST_SYMBOL_VISIBLE
+    circular_buffer
 {
     unsigned char* base_ = nullptr;
     std::size_t cap_ = 0;
@@ -111,19 +112,15 @@ class circular_buffer
         return cap_ - in_len_;
     }
 
-    BOOST_BUFFERS_DECL
     const_buffers_type
     data() const noexcept;
     
-    BOOST_BUFFERS_DECL
     mutable_buffers_type
     prepare(std::size_t n);
 
-    BOOST_BUFFERS_DECL
     void
     commit(std::size_t n) noexcept;
 
-    BOOST_BUFFERS_DECL
     void
     consume(std::size_t n) noexcept;
 };
diff --git a/include/boost/buffers/const_buffer_pair.hpp b/include/boost/buffers/const_buffer_pair.hpp
index e92a6f4..2e73e35 100644
--- a/include/boost/buffers/const_buffer_pair.hpp
+++ b/include/boost/buffers/const_buffer_pair.hpp
@@ -20,7 +20,8 @@ namespace buffers {
 
 /** A constant buffer pair
 */
-class const_buffer_pair
+class BOOST_SYMBOL_VISIBLE
+    const_buffer_pair
 {
 public:
     using value_type = const_buffer;
@@ -117,12 +118,10 @@ class const_buffer_pair
 #endif
 
 private:
-    BOOST_BUFFERS_DECL
     const_buffer_pair
     prefix_impl(
         std::size_t n) const noexcept;
 
-    BOOST_BUFFERS_DECL
     const_buffer_pair
     suffix_impl(
         std::size_t n) const noexcept;
diff --git a/include/boost/buffers/const_buffer_span.hpp b/include/boost/buffers/const_buffer_span.hpp
index 1e856ba..e5660b3 100644
--- a/include/boost/buffers/const_buffer_span.hpp
+++ b/include/boost/buffers/const_buffer_span.hpp
@@ -23,7 +23,8 @@ namespace buffers {
     Objects of this type meet the requirements
     of <em>ConstBufferSequence</em>.
 */
-class const_buffer_span
+class BOOST_SYMBOL_VISIBLE
+    const_buffer_span
 {
     const_buffer const* p_ = nullptr;
     std::size_t n_ = 0;
diff --git a/include/boost/buffers/const_buffer_subspan.hpp b/include/boost/buffers/const_buffer_subspan.hpp
index 7b39a4d..dba293b 100644
--- a/include/boost/buffers/const_buffer_subspan.hpp
+++ b/include/boost/buffers/const_buffer_subspan.hpp
@@ -25,7 +25,8 @@ class const_buffer_span;
     Objects of this type meet the requirements
     of <em>ConstBufferSequence</em>.
 */
-class const_buffer_subspan
+class BOOST_SYMBOL_VISIBLE
+    const_buffer_subspan
 {
     const_buffer const* p_ = nullptr;
     std::size_t n_ = 0;
@@ -55,7 +56,6 @@ class const_buffer_subspan
 
     /** Constructor.
     */
-    BOOST_BUFFERS_DECL
     const_buffer_subspan(
         const_buffer const* p,
         std::size_t n) noexcept;
@@ -109,10 +109,10 @@ class const_buffer_subspan
 #endif
 
 private:
-    BOOST_BUFFERS_DECL const_buffer_subspan
-        prefix_impl(std::size_t n) const noexcept;
-    BOOST_BUFFERS_DECL const_buffer_subspan
-        suffix_impl(std::size_t n) const noexcept;
+    const_buffer_subspan prefix_impl(
+        std::size_t n) const noexcept;
+    const_buffer_subspan suffix_impl(
+        std::size_t n) const noexcept;
 };
 
 } // buffers
diff --git a/include/boost/buffers/flat_buffer.hpp b/include/boost/buffers/flat_buffer.hpp
index 2042242..46099e6 100644
--- a/include/boost/buffers/flat_buffer.hpp
+++ b/include/boost/buffers/flat_buffer.hpp
@@ -18,7 +18,10 @@
 namespace boost {
 namespace buffers {
 
-/** A DynamicBuffer with a fixed capacity
+/** A DynamicBuffer with a fixed capacity.
+
+    Buffer sequences returned by this container
+    always have a single element.
 */
 class flat_buffer
 {
diff --git a/include/boost/buffers/mutable_buffer_pair.hpp b/include/boost/buffers/mutable_buffer_pair.hpp
index 1c5341f..9b7e1ff 100644
--- a/include/boost/buffers/mutable_buffer_pair.hpp
+++ b/include/boost/buffers/mutable_buffer_pair.hpp
@@ -19,7 +19,8 @@ namespace buffers {
 
 /** A mutable buffer pair
 */
-class mutable_buffer_pair
+class BOOST_SYMBOL_VISIBLE
+    mutable_buffer_pair
 {
 public:
     using value_type = mutable_buffer;
@@ -98,12 +99,10 @@ class mutable_buffer_pair
 #endif
 
 private:
-    BOOST_BUFFERS_DECL
     mutable_buffer_pair
     prefix_impl(
         std::size_t n) const noexcept;
 
-    BOOST_BUFFERS_DECL
     mutable_buffer_pair
     suffix_impl(
         std::size_t n) const noexcept;
diff --git a/include/boost/buffers/mutable_buffer_span.hpp b/include/boost/buffers/mutable_buffer_span.hpp
index 94b2d9d..e1edb3d 100644
--- a/include/boost/buffers/mutable_buffer_span.hpp
+++ b/include/boost/buffers/mutable_buffer_span.hpp
@@ -23,7 +23,8 @@ namespace buffers {
     Objects of this type meet the requirements
     of <em>MutableBufferSequence</em>.
 */
-class mutable_buffer_span
+class BOOST_SYMBOL_VISIBLE
+    mutable_buffer_span
 {
     mutable_buffer const* p_ = nullptr;
     std::size_t n_ = 0;
diff --git a/include/boost/buffers/mutable_buffer_subspan.hpp b/include/boost/buffers/mutable_buffer_subspan.hpp
index 8315fbc..2495ffd 100644
--- a/include/boost/buffers/mutable_buffer_subspan.hpp
+++ b/include/boost/buffers/mutable_buffer_subspan.hpp
@@ -25,7 +25,8 @@ class mutable_buffer_span;
     Objects of this type meet the requirements
     of <em>MutableBufferSequence</em>.
 */
-class mutable_buffer_subspan
+class BOOST_SYMBOL_VISIBLE
+    mutable_buffer_subspan
 {
     mutable_buffer const* p_ = nullptr;
     std::size_t n_ = 0;
@@ -55,7 +56,6 @@ class mutable_buffer_subspan
 
     /** Constructor.
     */
-    BOOST_BUFFERS_DECL
     mutable_buffer_subspan(
         mutable_buffer const* p,
         std::size_t n) noexcept;
@@ -109,10 +109,10 @@ class mutable_buffer_subspan
 #endif
 
 private:
-    BOOST_BUFFERS_DECL mutable_buffer_subspan
-        prefix_impl(std::size_t n) const noexcept;
-    BOOST_BUFFERS_DECL mutable_buffer_subspan
-        suffix_impl(std::size_t n) const noexcept;
+    mutable_buffer_subspan prefix_impl(
+        std::size_t n) const noexcept;
+    mutable_buffer_subspan suffix_impl(
+        std::size_t n) const noexcept;
 };
 
 } // buffers