Build error:

  CC     test_colorkey-test-colorkey.o
test-colorkey.c:48: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘*’ token
test-colorkey.c: In function ‘redraw_overlay’:
test-colorkey.c:58: warning: implicit declaration of function ‘gdk_draw_rectangle’
test-colorkey.c:58: warning: nested extern declaration of ‘gdk_draw_rectangle’
test-colorkey.c:58: error: ‘GtkStyle’ has no member named ‘white_gc’
test-colorkey.c:61: error: ‘trans_gc’ undeclared (first use in this function)
test-colorkey.c:61: error: (Each undeclared identifier is reported only once
test-colorkey.c:61: error: for each function it appears in.)
test-colorkey.c:70: warning: implicit declaration of function ‘gdk_draw_point’
test-colorkey.c:70: warning: nested extern declaration of ‘gdk_draw_point’
test-colorkey.c: In function ‘msg_state_changed’:
test-colorkey.c:140: error: ‘trans_gc’ undeclared (first use in this function)
test-colorkey.c:140: warning: implicit declaration of function ‘gdk_gc_new’
test-colorkey.c:140: warning: nested extern declaration of ‘gdk_gc_new’
test-colorkey.c:141: warning: implicit declaration of function ‘gdk_gc_set_rgb_fg_color’
test-colorkey.c:141: warning: nested extern declaration of ‘gdk_gc_set_rgb_fg_color’
make[3]: ** [test_colorkey-test-colorkey.o] Erro 1

It would be nice if we could fix that for GNOME's 2.91.1 release.