It fails to build on Lucid (amd64), the erroneous lines are as follows:

gui/calc/calc.o: In function `on_drawingarea1_expose_event':
/tmp/buildd/tiemu-3.02/src/gui/calc/calc.c:316: undefined reference to `GTK_WIDGET_STATE'
gui/calc/screen.o: In function `redraw_lcd':
/tmp/buildd/tiemu-3.02/src/gui/calc/screen.c:207: undefined reference to `GTK_WIDGET_STATE'
gui/calc/screen.o: In function `hid_update_lcd':
/tmp/buildd/tiemu-3.02/src/gui/calc/screen.c:327: undefined reference to `GTK_WIDGET_STATE'
/tmp/buildd/tiemu-3.02/src/gui/calc/screen.c:335: undefined reference to `GTK_WIDGET_STATE'
gui/calc/screen.o: In function `redraw_skin':
/tmp/buildd/tiemu-3.02/src/gui/calc/screen.c:190: undefined reference to `GTK_WIDGET_STATE'
gui/debugger/dbg_all.o: In function `gtk_debugger_refresh':
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_all.c:84: undefined reference to `GTK_WIDGET_VISIBLE'
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_all.c:86: undefined reference to `GTK_WIDGET_VISIBLE'
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_all.c:88: undefined reference to `GTK_WIDGET_VISIBLE'
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_all.c:90: undefined reference to `GTK_WIDGET_VISIBLE'
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_all.c:92: undefined reference to `GTK_WIDGET_VISIBLE'
gui/debugger/dbg_all.o:/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_all.c:94: more undefined references to `GTK_WIDGET_VISIBLE' follow
gui/debugger/dbg_all.o: In function `gtk_debugger_enter':
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_all.c:150: undefined reference to `GTK_WIDGET_SENSITIVE'
gui/debugger/dbg_wnds.o: In function `dbgwnds_hide_all':
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_wnds.c:149: undefined reference to `GTK_WIDGET_VISIBLE'
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_wnds.c:151: undefined reference to `GTK_WIDGET_VISIBLE'
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_wnds.c:153: undefined reference to `GTK_WIDGET_VISIBLE'
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_wnds.c:155: undefined reference to `GTK_WIDGET_VISIBLE'
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_wnds.c:157: undefined reference to `GTK_WIDGET_VISIBLE'
gui/debugger/dbg_wnds.o:/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_wnds.c:159: more undefined references to `GTK_WIDGET_VISIBLE' follow
gui/debugger/dbg_code.o: In function `dbgcode_quit_enabled':
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_code.c:1099: undefined reference to `GTK_WIDGET_SENSITIVE'
gui/debugger/dbg_heap.o: In function `dbgheap_display_window':
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_heap.c:174: undefined reference to `GTK_WIDGET_VISIBLE'
gui/debugger/dbg_iop.o: In function `dbgiop_display_window':
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_iop.c:458: undefined reference to `GTK_WIDGET_VISIBLE'
gui/debugger/dbg_mem.o: In function `dbgmem_display_window':
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_mem.c:438: undefined reference to `GTK_WIDGET_VISIBLE'
gui/debugger/dbg_pclog.o: In function `dbgpclog_display_window':
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_pclog.c:166: undefined reference to `GTK_WIDGET_VISIBLE'
gui/debugger/dbg_regs.o: In function `dbgregs_display_window':
/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_regs.c:305: undefined reference to `GTK_WIDGET_VISIBLE'
gui/debugger/dbg_stack.o:/tmp/buildd/tiemu-3.02/src/gui/debugger/dbg_stack.c:200: more undefined references to `GTK_WIDGET_VISIBLE' follow
collect2: ld returned 1 exit status
make[3]: *** [tiemu] Error 1
make[3]: Leaving directory `/tmp/buildd/tiemu-3.02/src'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/tmp/buildd/tiemu-3.02'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/tmp/buildd/tiemu-3.02'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2