Amaya build fails on x86_64

|/usr/bin/g++ -O2 -Wall -x c++ -D__cplusplus -D_UNIX -D_GTK

-DHAVE_CONFIG_H -I.. -I../../amaya/xpm -I../../thotlib/include
-I../../thotlib/internals/var -I../../thotlib/internals/h
-I../../thotlib/internals/f -I/usr/include/gtk-1.2
-I/usr/include/glib-1.2 -I/usr/lib64/glib/include -I/usr/X11R6/include
-I/usr/include -c ../../thotlib/dialogue/callback.c -o dialogue/callback.o
.../../thotlib/dialogue/callback.c: In function ‘ThotBool
CallRadioGTK(GtkWidget*, Cat_Context*)’:
.../../thotlib/dialogue/callback.c:602: error: cast from ‘void*’ to
‘guint’ loses precision
.../../thotlib/dialogue/callback.c:638: error: cast from ‘void*’ to
‘guint’ loses precision
.../../thotlib/dialogue/callback.c: In function ‘void
CallValueSet(GtkWidget*, Cat_Context*, char*)’:
.../../thotlib/dialogue/callback.c:1018: error: cast from ‘GtkWidget*’ to
‘int’ loses precision
.../../thotlib/dialogue/callback.c:1019: error: cast from ‘GtkWidget*’ to
‘int’ loses precision
.../../thotlib/dialogue/callback.c:1020: error: cast from ‘GtkWidget*’ to
‘int’ loses precision
.../../thotlib/dialogue/callback.c:1021: error: cast from ‘GtkWidget*’ to
‘int’ loses precision
make[1]: *** [dialogue/callback.o] Error 1
make[1]: Leaving directory
`/home/ellson/FIX/Linux.x86_64/build/Amaya/GTK/thotlib'
make: *** [thotlib] Error 2