Accents on QT5 with spanish keyboard are not displayed

On a spanish linux debian setup, using EGLFS, with locale apparently correctly set. All spanish keys work correctly except accents, or so called dead keys. The compose file seems to be fine `/usr/share/X11/locale/compose.dir`. Forced with QTCOMPOSE and XCOMPOSE with no avail. All other X11 and console apps work fine.

setxkbmap -print
xkb_keymap {
xkb_keycodes

{ include "evdev+aliases(qwerty)" }

;
xkb_types

{ include "complete" };
xkb_compat { include "complete" }

;
xkb_symbols

{ include "pc+es+inet(evdev)" }

;
xkb_geometry

{ include "pc(pc105)" }

;
};