Hi, I'm having trouble compiling Boost 1.51 on Cygwin 1.7.15, g++ (GCC) 4.5.3. It fails with: gcc.compile.c++ bin.v2/libs/graph/build/gcc-4.5.3/release/threading-multi/read_graphviz_new.o In file included from ./boost/proto/transform/when.hpp:25:0, from ./boost/proto/matches.hpp:43, from ./boost/proto/core.hpp:22, from ./boost/xpressive/regex_primitives.hpp:28, from ./boost/xpressive/xpressive_static.hpp:24, from ./boost/graph/graphviz.hpp:34, from libs\graph\src\read_graphviz_new.cpp:50: ./boost/proto/transform/env.hpp: In member function ‘boost::proto::functional::env_var<boost::proto::envns_::data_type>::impl<Env, true>::result_type boost::proto::functional::env_var<boost::proto::envns_::data_type>::impl<Env, true>::operator()(boost::proto::detail::arg<T>) const’: ./boost/proto/transform/env.hpp:330:36: error: ‘data’ is not a member of ‘boost::proto’ "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -mthreads -DBOOST_ALL_NO_LIB=1 -DBOOST_GRAPH_DYN_LINK=1 -DBOOST_HAS_ICU=1 -DNDEBUG -I"." -I"/usr/include" -I"libs/graph/src" -c -o "bin.v2\libs\graph\build\gcc-4.5.3\release\threading-multi\read_graphviz_new.o" "libs\graph\src\read_graphviz_new.cpp" ...failed gcc.compile.c++ bin.v2/libs/graph/build/gcc-4.5.3/release/threading-multi/read_graphviz_new.o... gcc.compile.c++ bin.v2/libs/graph/build/gcc-4.5.3/release/threading-multi/graphml.o In file included from ./boost/proto/transform/when.hpp:25:0, from ./boost/proto/matches.hpp:43, from ./boost/proto/core.hpp:22, from ./boost/xpressive/regex_primitives.hpp:28, from ./boost/xpressive/xpressive_static.hpp:24, from ./boost/graph/graphviz.hpp:34, from ./boost/graph/graphml.hpp:20, from libs\graph\src\graphml.cpp:17: ./boost/proto/transform/env.hpp: In member function ‘boost::proto::functional::env_var<boost::proto::envns_::data_type>::impl<Env, true>::result_type boost::proto::functional::env_var<boost::proto::envns_::data_type>::impl<Env, true>::operator()(boost::proto::detail::arg<T>) const’: ./boost/proto/transform/env.hpp:330:36: error: ‘data’ is not a member of ‘boost::proto’ "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -mthreads -DBOOST_ALL_NO_LIB=1 -DBOOST_GRAPH_DYN_LINK=1 -DBOOST_HAS_ICU=1 -DNDEBUG -I"." -I"/usr/include" -I"libs/graph/src" -c -o "bin.v2\libs\graph\build\gcc-4.5.3\release\threading-multi\graphml.o" "libs\graph\src\graphml.cpp" ...failed gcc.compile.c++ bin.v2/libs/graph/build/gcc-4.5.3/release/threading-multi/graphml.o... ...skipped <pbin.v2/libs/graph/build/gcc-4.5.3/release/threading-multi>cygboost_graph.dll for lack of <pbin.v2/libs/graph/build/gcc-4.5.3/release/threading-multi>read_graphviz_new.o... ...skipped <pbin.v2/libs/graph/build/gcc-4.5.3/release/threading-multi>libboost_graph.dll.a for lack of <pbin.v2/libs/graph/build/gcc-4.5.3/release/threading-multi>read_graphviz_new.o... ...skipped <p/usr/local/bin>cygboost_graph.dll for lack of <pbin.v2/libs/graph/build/gcc-4.5.3/release/threading-multi>cygboost_graph.dll... ...skipped <p/usr/local/lib>libboost_graph.dll.a for lack of <pbin.v2/libs/graph/build/gcc-4.5.3/release/threading-multi>libboost_graph.dll.a... gcc.compile.c++ bin.v2/libs/graph/build/gcc-4.5.3/release/link-static/threading-multi/read_graphviz_new.o In file included from ./boost/proto/transform/when.hpp:25:0, from ./boost/proto/matches.hpp:43, from ./boost/proto/core.hpp:22, from ./boost/xpressive/regex_primitives.hpp:28, from ./boost/xpressive/xpressive_static.hpp:24, from ./boost/graph/graphviz.hpp:34, from libs\graph\src\read_graphviz_new.cpp:50: ./boost/proto/transform/env.hpp: In member function ‘boost::proto::functional::env_var<boost::proto::envns_::data_type>::impl<Env, true>::result_type boost::proto::functional::env_var<boost::proto::envns_::data_type>::impl<Env, true>::operator()(boost::proto::detail::arg<T>) const’: ./boost/proto/transform/env.hpp:330:36: error: ‘data’ is not a member of ‘boost::proto’ "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -mthreads -DBOOST_ALL_NO_LIB=1 -DBOOST_HAS_ICU=1 -DNDEBUG -I"." -I"/usr/include" -I"libs/graph/src" -c -o "bin.v2\libs\graph\build\gcc-4.5.3\release\link-static\threading-multi\read_graphviz_new.o" "libs\graph\src\read_graphviz_new.cpp" ...failed gcc.compile.c++ bin.v2/libs/graph/build/gcc-4.5.3/release/link-static/threading-multi/read_graphviz_new.o... gcc.compile.c++ bin.v2/libs/graph/build/gcc-4.5.3/release/link-static/threading-multi/graphml.o In file included from ./boost/proto/transform/when.hpp:25:0, from ./boost/proto/matches.hpp:43, from ./boost/proto/core.hpp:22, from ./boost/xpressive/regex_primitives.hpp:28, from ./boost/xpressive/xpressive_static.hpp:24, from ./boost/graph/graphviz.hpp:34, from ./boost/graph/graphml.hpp:20, from libs\graph\src\graphml.cpp:17: ./boost/proto/transform/env.hpp: In member function ‘boost::proto::functional::env_var<boost::proto::envns_::data_type>::impl<Env, true>::result_type boost::proto::functional::env_var<boost::proto::envns_::data_type>::impl<Env, true>::operator()(boost::proto::detail::arg<T>) const’: ./boost/proto/transform/env.hpp:330:36: error: ‘data’ is not a member of ‘boost::proto’ "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -mthreads -DBOOST_ALL_NO_LIB=1 -DBOOST_HAS_ICU=1 -DNDEBUG -I"." -I"/usr/include" -I"libs/graph/src" -c -o "bin.v2\libs\graph\build\gcc-4.5.3\release\link-static\threading-multi\graphml.o" "libs\graph\src\graphml.cpp" ...failed gcc.compile.c++ bin.v2/libs/graph/build/gcc-4.5.3/release/link-static/threading-multi/graphml.o... ...skipped <pbin.v2/libs/graph/build/gcc-4.5.3/release/link-static/threading-multi>libboost_graph.a(clean) for lack of <pbin.v2/libs/graph/build/gcc-4.5.3/release/link-static/threading-multi>read_graphviz_new.o... ...skipped <pbin.v2/libs/graph/build/gcc-4.5.3/release/link-static/threading-multi>libboost_graph.a for lack of <pbin.v2/libs/graph/build/gcc-4.5.3/release/link-static/threading-multi>read_graphviz_new.o... ...skipped <p/usr/local/lib>libboost_graph.a for lack of <pbin.v2/libs/graph/build/gcc-4.5.3/release/link-static/threading-multi>libboost_graph.a...