The following posts in libsigc-list discuss an issue that will affect
not only libsigc++.
https://mail.gnome.org/archives/libsigc-list/2012-July/msg00007.html
https://mail.gnome.org/archives/libsigc-list/2012-July/msg00011.html
libsigc++, glibmm, gtkmm and perhaps other modules assume that '#include
<cxxxxx>' (cxxxxx = cstddef, cstdlib, ctime, etc.) declares data types
and functions in the global namespace. With gcc version 4.7 they are
declared only in namespace std.
Kjell
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