glib/gmain.c:480:1: error: missing initializer for field ‘closure_callback’ of ‘GSourceFuncs’ {aka ‘struct _GSourceFuncs’} [-Werror=missing-field-initializers]
 };
 ^
In file included from glib/giochannel.h:33,
                 from glib/glib.h:54,
                 from glib/glib-unix.h:33,
                 from glib/gmain.c:50:
glib/gmain.h:262:19: note: ‘closure_callback’ declared here
   GSourceFunc     closure_callback;
                   ^~~~~~~~~~~~~~~~
glib/gmain.c:491:1: error: missing initializer for field ‘closure_callback’ of ‘GSourceFuncs’ {aka ‘struct _GSourceFuncs’} [-Werror=missing-field-initializers]
 };
 ^
In file included from glib/giochannel.h:33,
                 from glib/glib.h:54,
                 from glib/glib-unix.h:33,
                 from glib/gmain.c:50:
glib/gmain.h:262:19: note: ‘closure_callback’ declared here
   GSourceFunc     closure_callback;
                   ^~~~~~~~~~~~~~~~
glib/gmain.c:499:1: error: missing initializer for field ‘closure_callback’ of ‘GSourceFuncs’ {aka ‘struct _GSourceFuncs’} [-Werror=missing-field-initializers]
 };
 ^
In file included from glib/giochannel.h:33,
                 from glib/glib.h:54,
                 from glib/glib-unix.h:33,
                 from glib/gmain.c:50:
glib/gmain.h:262:19: note: ‘closure_callback’ declared here
   GSourceFunc     closure_callback;
                   ^~~~~~~~~~~~~~~~
glib/gmain.c:507:1: error: missing initializer for field ‘closure_callback’ of ‘GSourceFuncs’ {aka ‘struct _GSourceFuncs’} [-Werror=missing-field-initializers]
 };
 ^
In file included from glib/giochannel.h:33,
                 from glib/glib.h:54,
                 from glib/glib-unix.h:33,
                 from glib/gmain.c:50:
glib/gmain.h:262:19: note: ‘closure_callback’ declared here
   GSourceFunc     closure_callback;
                   ^~~~~~~~~~~~~~~~
glib/gmain.c: In function ‘g_source_set_callback_indirect’:
glib/gmain.c:1615:68: error: suggest braces around empty body in an ‘if’ statement [-Werror=empty-body]
                                               callback_funcs->get));
                                                                    ^