Found problem that caused compilation errors with gcc 3.4.6:

template instatiated with "runtime const" instead of "compile time const"

--- boost-1.46.0/boost/property_tree/detail/xml_parser_read_rapidxml.hpp.orig	2010-10-15 08:40:04.000000000 -0400
+++ boost-1.46.0/boost/property_tree/detail/xml_parser_read_rapidxml.hpp	2011-03-07 15:45:58.000000000 -0500
@@ -103,13 +103,14 @@
 
         try {
             // Parse using appropriate flags
-            const int f_tws = parse_normalize_whitespace
-                            | parse_trim_whitespace;
-            const int f_c = parse_comment_nodes;
+            enum {    f_tws = parse_normalize_whitespace
+                            | parse_trim_whitespace };
+
+            enum {    f_c = parse_comment_nodes};
             // Some compilers don't like the bitwise or in the template arg.
-            const int f_tws_c = parse_normalize_whitespace
+            enum {    f_tws_c = parse_normalize_whitespace
                               | parse_trim_whitespace
-                              | parse_comment_nodes;
+                              | parse_comment_nodes };
             xml_document<Ch> doc;
             if (flags & no_comments) {
                 if (flags & trim_whitespace)