[gtkmm] Deprecated warnings

["Miguel M." <miguelmmc terra es>]

Hello.
I'm having a little but awful problem.
I've a project with kdevelop 2.1 and gtkmm-2.2.3, glademm.
All it's going ok, but when I compile all, a lot(A LOT!) of warnings
say:

../pixmaps/led_r_small.xpm:273: warning: deprecated conversion from
string constant to char *.

In the dialog "Project options" I wrote:
->Compiler options->Flags and warnings->C++ compiler flags(CXXFLAGS):
`pkg-config --cflags --libs-only-l gtkmm-2.0 gthread-2.0`

I've tried -Wno-deprecated, nothing it's happening.

Can you help me?

Thanks.

Miguel.