Latest build fails on:
/usr/include/glib-2.0/gobject/gtype.h:725:1: note: declared here
  725 | {
      | ^
In file included from /usr/include/gtk-2.0/gtk/gtktoolitem.h:31,
                 from /usr/include/gtk-2.0/gtk/gtktoolbutton.h:30,
                 from /usr/include/gtk-2.0/gtk/gtkmenutoolbutton.h:30,
                 from /usr/include/gtk-2.0/gtk/gtk.h:126:
/usr/include/gtk-2.0/gtk/gtktooltips.h:73:3: warning: ‘GTimeVal’ is deprecated: Use 'GDateTime' instead [-Wdeprecated-declarations]
   73 |   GTimeVal last_popdown;
      |   ^~~~~~~~
In file included from /usr/include/glib-2.0/glib/galloca.h:34,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/glib-2.0/gobject/gbinding.h:30:
/usr/include/glib-2.0/glib/gtypes.h:580:8: note: declared here
  580 | struct _GTimeVal
      |        ^~~~~~~~~
make[2]: *** [Makefile:144: all-recursive] Error 1
make[1]: *** [Makefile:294: all-recursive-am] Error 2
Do not worry, as I said, xhydra is really optional. ./hydra is ready to go!

This looks like the problem is only with optional xhydra.
Fails on f42, f43, f44

Reproducible: Always