diff -r 510d5bd079ad boost/program_options/detail/value_semantic.hpp
--- a/boost/program_options/detail/value_semantic.hpp	Fri Jun 27 15:59:57 2008 -0600
+++ b/boost/program_options/detail/value_semantic.hpp	Mon Jun 30 18:22:19 2008 -0600
@@ -55,13 +55,13 @@
         {
             static std::basic_string<charT> empty;
             if (v.size() > 1)
-                throw validation_error("multiple values not allowed");
+                boost::throw_exception(validation_error("multiple values not allowed"));
             if (v.size() == 1)
                 return v.front();
             else if (allow_empty)
                 return empty;
             else
-                throw validation_error("at least one value required");
+                boost::throw_exception(validation_error("at least one value required"));
         }
 
         /* Throws multiple_occurrences if 'value' is not empty. */
diff -r 510d5bd079ad libs/program_options/src/cmdline.cpp
--- a/libs/program_options/src/cmdline.cpp	Fri Jun 27 15:59:57 2008 -0600
+++ b/libs/program_options/src/cmdline.cpp	Mon Jun 30 18:22:19 2008 -0600
@@ -151,7 +151,7 @@
             error = "style disallows all characters for short options";
 
         if (error)
-            throw invalid_command_line_style(error);
+            boost::throw_exception(invalid_command_line_style(error));
 
         // Need to check that if guessing and long disguise are enabled
         // -f will mean the same as -foo
@@ -269,8 +269,8 @@
                 if (opt.position_key != -1) {
                     if (position >= m_positional->max_total_count())
                     {
-                        throw too_many_positional_options_error(
-                            "too many positional options");
+                        boost::throw_exception(too_many_positional_options_error(
+                                               "too many positional options"));
                     }
                     opt.string_key = m_positional->name_for_position(position);
                     ++position;
@@ -323,8 +323,8 @@
         if (present_tokens >= min_tokens)
         {
             if (!opt.value.empty() && max_tokens == 0) {
-                throw invalid_command_line_syntax(opt.string_key,
-                    invalid_command_line_syntax::extra_parameter);                                                                
+                boost::throw_exception(invalid_command_line_syntax(opt.string_key,
+                                             invalid_command_line_syntax::extra_parameter));
             }
             
             max_tokens -= opt.value.size();
@@ -346,8 +346,8 @@
         }
         else
         {
-            throw invalid_command_line_syntax(opt.string_key,
-                invalid_command_line_syntax::missing_parameter); 
+            boost::throw_exception(invalid_command_line_syntax(opt.string_key,
+                                            invalid_command_line_syntax::missing_parameter)); 
 
         }
     }
@@ -367,8 +367,8 @@
                 name = tok.substr(2, p-2);
                 adjacent = tok.substr(p+1);
                 if (adjacent.empty())
-                    throw invalid_command_line_syntax(name,
-                      invalid_command_line_syntax::empty_adjacent_parameter);
+                    boost::throw_exception( invalid_command_line_syntax(name,
+                                                      invalid_command_line_syntax::empty_adjacent_parameter));
             }
             else
             {
diff -r 510d5bd079ad libs/program_options/src/variables_map.cpp
--- a/libs/program_options/src/variables_map.cpp	Fri Jun 27 15:59:57 2008 -0600
+++ b/libs/program_options/src/variables_map.cpp	Mon Jun 30 18:22:19 2008 -0600
@@ -74,11 +74,13 @@
             try {
                 d.semantic()->parse(v.value(), options.options[i].value, utf8);
             }
+#ifndef BOOST_NO_EXCEPTIONS
             catch(validation_error& e)
             {
                 e.set_option_name(name);
                 throw;
             }
+#endif
             v.m_value_semantic = d.semantic();
             
             // The option is not composing, and the value is explicitly