list<string> tc_archs = list_files(toolchains_dir/use_toolchain/"prebuilt");
string use_arch;
for(list<string>::const_iterator i=tc_archs.begin(); i!=tc_archs.end(); ++i)
list<string> tc_archs = list_files(toolchains_dir/use_toolchain/"prebuilt");
string use_arch;
for(list<string>::const_iterator i=tc_archs.begin(); i!=tc_archs.end(); ++i)